Peralkaline and feldspathoidal gneisses form a layer (7-20 m thick) within the Precambrian Dahomeyan basement gneisses. It can be traced almost continuously for 76 km (Kesse 1985) in the vicinity of the towns of Somanya, Kpong and Pore (Holm 1974).
Approx coords range: 6º00' - 6º18'N; 0º02'W - 0º15'E.

The nepheline gneisses have been investigated as a feedstock for glass and ceramics (Allen & Charsley 1968).

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

19 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

Reference: Allen, J. B., & Charsley, T. J. (1968). Nepheline-syenite and Phonolite. HMSO. Holm, R. F. (1971). Some garnets, pyroxenes, and amphiboles from nepheline gneisses in Ghana. American Mineralogist: Journal of Earth and Planetary Materials, 56(11-12), 2111-2122. Holm, R. F. (1974). Petrology of alkalic gneiss in the Dahomeyan of Ghana. Geological Society of America Bulletin, 85(9), 1441-1448. doi.org/10.1130/0016-7606(1974)85<1441:POAGIT>2.0.CO;2 Kesse, G. O. (1985). The mineral and rock resources of Ghana. Balkema, Rotterdam and Boston. Allen, J. B., & Charsley, T. J. (1968). Nepheline-syenite and Phonolite. HMSO. Holm, R. F. (1971). Some garnets, pyroxenes, and amphiboles from nepheline gneisses in Ghana. American Mineralogist: Journal of Earth and Planetary Materials, 56(11-12), 2111-2122. Holm, R. F. (1974). Petrology of alkalic gneiss in the Dahomeyan of Ghana. Geological Society of America Bulletin, 85(9), 1441-1448. doi.org/10.1130/0016-7606(1974)85<1441:POAGIT>2.0.CO;2 Kesse, G. O. (1985). The mineral and rock resources of Ghana. Balkema, Rotterdam and Boston.

ⓘ Albite

Formula: Na(AlSi₃O₈)

ⓘ 'Allanite Group'

Formula: {A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

Description: Amphiboles range up to 10 modal percent with biotite and aegirine-rich pyroxene in the leucocratic nepheline gneisses, and may be as much as 55 percent in the mafic and feldspar-poor nepheline gneisses where they occur with grandite and aegirine-augites closer to soda augite. The amphiboles are black in hand specimens and may form a lineation. Hastingsite (as defined by Leake, 1968) and iron-rich alkaline amphibole are the only types present. The leucocratic nepheline gneisses contain amphiboles richest in Na and Fe3+. (Holm, 1971)

ⓘ Andradite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

ⓘ Calcite

Formula: CaCO₃

ⓘ Cancrinite

Formula: (Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O

ⓘ Epidote

Formula: {Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)

ⓘ 'Ferro-ferri-sadanagaite' ?

Formula: {Na}{Ca₂}{Fe²⁺₃Fe³⁺₂}(Al₃Si₅O₂₂)(OH)₂

Description: Holm (1974) provide a wet-chemical analysis corresponding to ferro-ferri-sadanagaite: SiO2, 37.02% TiO2, 1.64% Al2O3, 17.29% Fe2O3, 7.79% FeO, 14.94% MnO, 0.53% MgO, 5.19% CaO, 9.46% Na2O, 3.38% K2O, 2.4% When this is normalized (using Locock 2014), the empirical formula becomes (Na0.592K0.469)Σ1.061 (Ca1.552Na0.411Mn0.038)Σ2.001 (Feii1.913Mg1.184FeIII0.897Al0.786Ti0.189Mnii0.031)Σ5 (Si5.667Al2.333)Σ8 O22 ((OH)1.622O0.378)Σ2. With exception of a slightly high A content (1.061 apfu), Holm's data normalizes well. However, his other analyses show a too high C3+ content, and the interpretation of this analysis as ferro-ferri-sadanagaite is therefore questioned.

Reference: Holm, R. F. (1971). Some garnets, pyroxenes, and amphiboles from nepheline gneisses in Ghana. American Mineralogist: Journal of Earth and Planetary Materials, 56(11-12), 2111-2122. Locock, A. J. (2014): An Excel spreadsheet to classify chemical analyses of amphiboles following the IMA 2012 recommendations. Computers & Geosciences 62, 1-11.

ⓘ Fluorite

Formula: CaF₂

ⓘ 'Garnet Group'

Formula: X₃Z₂(SiO₄)₃

ⓘ Grossular

Formula: Ca₃Al₂(SiO₄)₃

ⓘ Hastingsite

Formula: NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂OH₂

ⓘ Microcline

Formula: K(AlSi₃O₈)

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

ⓘ Potassic-ferro-ferri-taramite ?

Formula: K(CaNa)(Fe²⁺₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂

Description: Holm (1974) provide a wet-chemical analysis corresponding to potassic-ferro-ferri-taramite: SiO2, 37.58% TiO2, 1.66% Al2O3, 15.11% Fe2O3, 20.75% FeO, 9.25% MnO, 1.06% MgO, 1.06% CaO, 5.53% Na2O, 5.1% K2O, 2.8% When this is normalized (using Locock 2014), the empirical formula becomes (K0.55Na0.434)Σ0.984 (Na1.088Ca0.912)Σ2 (FeIII2.404Feii1.191Al0.526Mg0.243Ti0.192Mnii0.138)Σ4.694 (Si5.785Al2.215)Σ8 O22 ((OH)1.615O0.385)Σ2. This gives a low total in the C position ( 4.694) of which 3.122 apfu is trivalent. Both of these indicate analytical errors.

ⓘ Potassic-ferro-sadanagaite ?

Formula: {K}{Ca₂}{Fe²⁺₃Al₂}(Al₃Si₅O₂₂)(OH)₂

Description: Holm (1974) provide a wet-chemical analysis corresponding to potassic-ferro-sadanagaite: SiO2, 35.52% TiO2, 1.798% Al2O3, 19.57% Fe2O3, 6.51% FeO, 18.45% MnO, 0.51% MgO, 2.72% CaO, 9.27% Na2O, 2.84% K2O, 2.58% When this is normalized (using Locock 2014), the empirical formula becomes (K0.509Na0.509)Σ1.018 (Ca1.537Na0.343Mn0.067Fe0.052)Σ1.999 (Feii2.336Al1.069FeIII0.758Mg0.628Ti0.209)Σ5 (Si5.498Al2.502)Σ8 O22 ((OH)1.581O0.419)Σ2. With exception of a slightly high A content (1.018 apfu), Holm's data normalizes well. However, his other analyses show a too high C³⁺ content, and the interpretation of this analysis as potassic-ferro-sadanagaite is therefore questioned.

ⓘ Quartz

Formula: SiO₂

ⓘ 'Sodic amphibole'

ⓘ Titanite

Formula: CaTi(SiO₄)O

ⓘ Vesuvianite

Formula: Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉

ⓘ Zircon

Formula: Zr(SiO₄)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	Andradite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Cancrinite	9.FB.05	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
ⓘ	Epidote	9.BG.05a	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
ⓘ	'Ferro-ferri-sadanagaite' ?	9.DE.15	{Na}{Ca₂}{Fe²⁺₃Fe³⁺₂}(Al₃Si₅O₂₂)(OH)₂
ⓘ	Grossular	9.AD.25	Ca₃Al₂(SiO₄)₃
ⓘ	Hastingsite	9.DE.15	NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂OH₂
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Potassic-ferro-ferri-taramite ?	9.DE.20	K(CaNa)(Fe²⁺₃Fe³⁺₂)(Al₂Si₆O₂₂)(OH)₂
ⓘ	Potassic-ferro-sadanagaite ?	9.DE.15	{K}{Ca₂}{Fe²⁺₃Al₂}(Al₃Si₅O₂₂)(OH)₂
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Vesuvianite	9.BG.35	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
Unclassified Minerals, Rocks, etc.
ⓘ	'Allanite Group'	-	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'Sodic amphibole'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
H	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
H	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
H	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
H	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
H	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	Oxygen
O	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
O	ⓘ Calcite	CaCO₃
O	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Grossular	Ca₃Al₂(SiO₄)₃
O	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
O	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
O	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	ⓘ Fluorite	CaF₂
Na	Sodium
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
Na	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Na	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
Na	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Al	Aluminium
Al	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
Al	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Al	ⓘ Grossular	Ca₃Al₂(SiO₄)₃
Al	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
Al	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
Al	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
Si	Silicon
Si	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Allanite Group	{A1²⁺REE³⁺}{M1³⁺M2³⁺M3²⁺}(Si₂O₇)(SiO₄)O(OH)
Si	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Grossular	Ca₃Al₂(SiO₄)₃
Si	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
Si	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
Si	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
K	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
Ca	Calcium
Ca	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ca	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Grossular	Ca₃Al₂(SiO₄)₃
Ca	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
Ca	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
Ca	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
Ti	Titanium
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Titanite	CaTi(SiO₄)O
Fe	Iron
Fe	ⓘ Epidote	{Ca₂}{Al₂Fe³⁺}(Si₂O₇)(SiO₄)O(OH)
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Hastingsite	NaCa₂(Fe₄²⁺Fe³⁺)(Si₆Al₂)O₂₂OH₂
Fe	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Fe	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Potassic-ferro-ferri-taramite	K(CaNa)(Fe₃²⁺Fe₂³⁺)(Al₂Si₆O₂₂)(OH)₂
Fe	ⓘ Potassic-ferro-sadanagaite	{K}{Ca₂}{Fe₃²⁺Al₂}(Al₃Si₅O₂₂)(OH)₂
Fe	ⓘ Ferro-ferri-sadanagaite	{Na}{Ca₂}{Fe₃²⁺Fe₂³⁺}(Al₃Si₅O₂₂)(OH)₂
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)

References

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Woolley, A. R. (2001). Alkaline rocks and carbonatites of the world. Part 3: Africa. Geological Society. Natural History Museum, London, p. 93.

Allen, J. B., & Charsley, T. J. (1968). Nepheline-syenite and Phonolite. HMSO.

Holm, R. F. (1971). Some garnets, pyroxenes, and amphiboles from nepheline gneisses in Ghana. American Mineralogist: Journal of Earth and Planetary Materials, 56(11-12), 2111-2122.

Holm, R. F. (1974). Petrology of alkalic gneiss in the Dahomeyan of Ghana. Geological Society of America Bulletin, 85(9), 1441-1448. doi.org/10.1130/0016-7606(1974)85<1441:POAGIT>2.0.CO;2

Kesse, G. O. (1985). The mineral and rock resources of Ghana. Balkema, Rotterdam and Boston.

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Somanya, Kpong and Pore Areas, Asuogyaman District, Eastern Region, GhanaiRegional Level TypesSomanya，Kpong and Pore AreasOccurrence Asuogyaman DistrictDistrict Eastern RegionRegion GhanaCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }