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Epidote-(Sr)

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01853720014949103264515.jpg
Epidote-(Sr)

Benallt Mine, Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd, Wales, UK
01853720014949103264515.jpg
Epidote-(Sr)

Benallt Mine, Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd, Wales, UK
01853720014949103264515.jpg
Epidote-(Sr)

Benallt Mine, Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd, Wales, UK
Hide all sections | Show all sections

About Epidote-(Sr)Hide

Formula:
{CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Crystal System:
Monoclinic
Name:
Named in 2008 by T. Minakawa, H. Fukushima, D. Nishio-Hamane and H. Miura for the chemical relationship to epidote.
Isostructural with:
Epidote
Clinozoisite Subgroup of the Epidote Group.

The Fe(III) analogue of clinozoisite-(Sr) and piemontite-(Sr).


Classification of Epidote-(Sr)Hide

IMA status:
Approved
Approval Year:
2006
Strunz 8th ed.:
8/C.23-
Nickel-Strunz 10th (pending) ed.:
9.BG.05a

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Dana 8th ed.:
58.2.2.3

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

Physical Properties of Epidote-(Sr)Hide

Transparency:
Translucent
Cleavage:
Perfect
parallel to {001}

Optical Data of Epidote-(Sr)Hide

Type:
Biaxial (-)
RI values:
nα = 1.737(2) nβ = 1.780(2) nγ = 1.792(2)
2V:
Calculated: 62°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Colour in reflected light:
pale reddish brown to brown
Pleochroism:
Visible
Comments:
X: pale greenish yellow, and Y = Z: pale reddish brown to brownish pink

Chemical Properties of Epidote-(Sr)Hide

Formula:
{CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaSr(Al2Fe3+)[Si2O7][SiO4]O(OH)
Elements listed:
Al, Ca, Fe, H, O, Si, Sr - search for minerals with similar chemistry

Chemical AnalysisHide

Oxide wt%:
 1
SiO232.4 %
Al2O319.0 %
Fe2O313.4 %
Mn2O30.7 %
MnO1.3 %
CaO12.4 %
SrO7.2 %
PbO10.9 %
H2O1.6 %
Total:98.9 %
Sample references:
IDLocalityReference
1Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USAFrank K. Mazdab collection (thin section FKM-88; https://www.rockptx.com/fkm-76-to-fkm-100/#FKM-88)

Crystallography of Epidote-(Sr)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.928(5) Å, b = 5.652(1) Å, c = 10.244(5) Å
β = 114.46(4)°
Ratio:
a:b:c = 1.58 : 1 : 1.812
Unit Cell V:
470.5 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.92 Å(100)
2.58 Å(49)
3.50 Å(42)
2.61 Å(42)
2.72 Å(41)
2.83 Å(32)
3.26 Å(23)

Type Occurrence of Epidote-(Sr)Hide

Type Locality:
ⓘ Ananai mine, Nankoku city, Kochi Prefecture, Japan
General Appearance of Type Material:
prismatic crystals up to 1 cm in length
Place of Conservation of Type Material:
Museum at the Hokkaido University, Sapporo, Japan (specimen no. Mineral-07400)
Associated Minerals at Type Locality:
TinzenitePumpellyitePiemontite-(Sr)GanophylliteCalcite

Synonyms of Epidote-(Sr)Hide

Other Language Names for Epidote-(Sr)Hide

Relationship of Epidote-(Sr) to other SpeciesHide

Member of:
Epidote Group > Epidote Supergroup
Other Members of this group:
Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Piemontite-(Pb){CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH) Mon. 2/m : P21/m
Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Unnamed (Fe3+ analogue of piemontite-(Pb))CaPbFe3+AlMn3+(Si2O7)(SiO4)O(OH)
Unnamed (Fe3+-analogue of piemontite)CaCaFe3+AlMn3+(Si2O7)(SiO4)(OH,O)2
Unnamed (Ga analogue of epidote)CaCaAlAlGa(Si2O7)(SiO4)O(OH)
Unnamed (Ga-dominant member of the epidote group){Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH)

Related Minerals - Nickel-Strunz GroupingHide

9.BG.MagnesiovesuvianiteCa19MgAl4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.AlumovesuvianiteCa19AlAl4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05aHancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aMukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aPiemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2Mon. 2/m : P21/m
9.BG.9.BG.Ferriakasakaite-(La){CaLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriandrosite-(Ce){Mn2+REE}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH)
9.BG.9.BGFerriperbøeite-(Ce)(CaCe3)(Fe3+Al2Fe2+)(Si2O7)(SiO4)3O(OH)2Mon. 2/m : P21/m
9.BG.10ZoisiteCa2Al3[Si2O7][SiO4]O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20OkhotskiteCa2Mn3+Mn3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20ShuiskiteCa2MgCr3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20Pumpellyite-(Al)Ca2AlAl2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20PoppiiteCa2V3+V3+2(Si2O7)(SiO4)([OH]O) · H2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
9.BG.35VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19MgAl4(Al,Mg)8(B,☐)4☐[Si2O7]4[(SiO4)10]O(O,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m)
9.BG.35CyprineCa19Cu2+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7Mon.
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2Mon. 2/m : P21/b
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si2O15(OH)2FMon. 2/m : P21/m

Related Minerals - Dana Grouping (8th Ed.)Hide

58.2.2.1Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
58.2.2.2Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)([OH]O) · H2OMon.
58.2.2.3Okhotskite-(Mg)Ca8(Mn2+,Mg)(Mn3+,Al,Fe3+)(SiO4)(Si2O7)(OH)2 · H2OMon.
58.2.2.5Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
58.2.2.6Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)([OH]O) · H2OMon.
58.2.2.7Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon.
58.2.2.8Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
58.2.2.9ShuiskiteCa2MgCr3+2(Si2O7)(SiO4)(OH)2 · H2OMon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Epidote-(Sr)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Minakawa, T., H. Fukushima, D. Nishio-Hamane & H. Miura (2008): Epidote-(Sr), CaSrAl2Fe3+(Si2O7)(SiO4)(OH), a new mineral from the Ananai mine, Kochi Prefecture, Japan. Journal of Mineralogical and Petrological Sciences 103, 400-406.

Internet Links for Epidote-(Sr)Hide

Localities for Epidote-(Sr)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Nouvelle-Aquitaine
    • Pyrénées-Atlantiques
      • Aramits
        • Ance
MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842.
MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842.
  • Occitanie
    • Hautes-Pyrénées
      • La Barthe-de-Neste
        • Avezac-Prat-Lahitte
MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842.
Japan (TL)
 
  • Kochi Prefecture
    • Nankoku city
Journal of Mineralogical and Petrological Sciences 103,400-406(2008)
  • Niigata Prefecture
Miyajima H (2014) Jadeitite from Itoigawa, Niigata Prefecture, central Japan. 21 st meeting of the International Mineralogical Association. p 200
  • Tokyo Metropolis
    • Nishitama district
      • Okutama-cho
Tanaka, T. & Hamane, D. (2016) Epidote-(Sr) from Shiromaru mine, Tokyo prefecture, Japan. (conference presentation R1-P14)
UK
 
  • Wales
    • Gwynedd
      • Lleyn Peninsula
        • Llanfaelrhys
          • Rhiw
Cotterell, T., Tayler, R.(2012): Epidote-(Sr) and piemontite-(Sr): two minerals new to Britain from Benallt mine, Pen Llŷn, Gwynedd, Wales. UK Journal of Mines and Minerals 33:39-42.
USA
 
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Franklin
Frank K. Mazdab collection (thin section FKM-88; https://www.rockptx.com/fkm-76-to-fkm-100/#FKM-88)
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