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Glaucochroite

This page kindly sponsored in memory of Charles Hyde Warren
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About GlaucochroiteHide

Formula:
CaMn2+SiO4
Colour:
Bluish-gray, pink, brown, or white.
Lustre:
Vitreous, Sub-Vitreous, Resinous
Hardness:
6
Specific Gravity:
3.407
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1899 by Samuel L. Penfield and Charles H. Warren from the Greek γλαυκός for "sky-blue" and χρώσις "coloring", in allusion to its color.

Classification of GlaucochroiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1975
9.AC.05

9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
51.3.2.3

51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral [6] coordination
14.18.14

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

Physical Properties of GlaucochroiteHide

Vitreous, Sub-Vitreous, Resinous
Transparency:
Transparent, Translucent, Opaque
Colour:
Bluish-gray, pink, brown, or white.
Comment:
May show the alexandrite-effect
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001}
Fracture:
Conchoidal, Sub-Conchoidal
Density:
3.407 g/cm3 (Measured)    3.465 g/cm3 (Calculated)

Optical Data of GlaucochroiteHide

Type:
Biaxial (-)
RI values:
nα = 1.679 - 1.686 nβ = 1.716 - 1.723 nγ = 1.729 - 1.736
2V:
Measured: 61° , Calculated: 60°
Birefringence:
0.050
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
medium
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of GlaucochroiteHide

Formula:
CaMn2+SiO4
IMA Formula:
CaMn2+(SiO4)
Common Impurities:
Fe,Zn,Pb,Mg

Crystallography of GlaucochroiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.923 Å, b = 11.192 Å, c = 6.512 Å
Ratio:
a:b:c = 0.44 : 1 : 0.582
Unit Cell V:
358.80 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Usually massive, rarely in short prismatic crystals.
Comment:
Pbnm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.54 Å(30)
4.23 Å(40)
3.91 Å(10)
3.69 Å(60)
3.25 Å(20)
2.96 Å(60)
2.81 Å(20)
2.69 Å(80)
2.63 Å(80)
2.56 Å(20)
2.44 Å(30)
2.25 Å(20)
2.19 Å(20)
2.03 Å(20)
1.95 Å(20)
1.85 Å(100)
1.79 Å(20)
1.77 Å(20)
1.75 Å(20)
1.72 Å(20)
1.71 Å(20)
1.62 Å(40)
1.61 Å(40)
1.58 Å(20)
1.52 Å(30)
1.43 Å(20)
1.42 Å(30)
1.23 Å(20)
1.19 Å(20)
1.14 Å(20)
1.13 Å(50)
1.11 Å(50)
1.06 Å(40)
Comments:
ICDD 14-376

Type Occurrence of GlaucochroiteHide

General Appearance of Type Material:
Massive material in franklinite-willemite-zincite ore with hardystonite and calcite.

Synonyms of GlaucochroiteHide

Other Language Names for GlaucochroiteHide

Relationship of Glaucochroite to other SpeciesHide

Member of:
Other Members of this group:
AsimowiteFe2SiO4Orth. mmm (2/m 2/m 2/m) : Imma
Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
FayaliteFe2+2SiO4Orth. mmm (2/m 2/m 2/m)
ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
LaihuniteFe2+Fe3+2(SiO4)2Mon.
LarniteCa2SiO4Mon. 2/m
Liebenbergite(Ni,Mg)2SiO4Orth.
MonticelliteCaMgSiO4Orth.
Roepperite (of Brush)(Fe2+2,Mn,Zn)SiO4
TephroiteMn2+2SiO4Orth. mmm (2/m 2/m 2/m)
Wadsleyite(Mg,Fe2+)2(SiO4)Orth.

Common AssociatesHide

AndraditeCa3Fe3+2(SiO4)3
BaryteBaSO4
CalciteCaCO3
ClinohedriteCaZn(SiO4) · H2O
CopperCu
CuspidineCa4(Si2O7)(F,OH)2
DiopsideCaMgSi2O6
EsperitePbCa2Zn3(SiO4)3
FrankliniteZn2+Fe3+2O4
HardystoniteCa2Zn(Si2O7)
LeucophoeniciteMn2+7(SiO4)3(OH)2
LeucophoeniciteMn2+7(SiO4)3(OH)2
WillemiteZn2SiO4
ZinciteZnO
Associated Minerals Based on Photo Data:
13 photos of Glaucochroite associated with WillemiteZn2SiO4
6 photos of Glaucochroite associated with FrankliniteZn2+Fe3+2O4
5 photos of Glaucochroite associated with ZinciteZnO
3 photos of Glaucochroite associated with EsperitePbCa2Zn3(SiO4)3
3 photos of Glaucochroite associated with HardystoniteCa2Zn(Si2O7)
3 photos of Glaucochroite associated with ClinohedriteCaZn(SiO4) · H2O
2 photos of Glaucochroite associated with LeucophoeniciteMn2+7(SiO4)3(OH)2
2 photos of Glaucochroite associated with CalciteCaCO3
1 photo of Glaucochroite associated with ChalcophaniteZnMn4+3O7 · 3H2O

Related Minerals - Nickel-Strunz GroupingHide

9.AC.AhrensiteSiFe2O4Iso. m3m (4/m 3 2/m)
9.AC.05FayaliteFe2+2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
9.AC.05LaihuniteFe2+Fe3+2(SiO4)2Mon.
9.AC.05Liebenbergite(Ni,Mg)2SiO4Orth.
9.AC.05TephroiteMn2+2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.10MonticelliteCaMgSiO4Orth.
9.AC.15BrunogeieriteGe4+Fe2+2O4Iso. m3m (4/m 3 2/m) : Fd3m
9.AC.15Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
9.AC.20ChesnokoviteNa2[SiO2(OH)2] · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca

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

51.3.2.1MonticelliteCaMgSiO4Orth.
51.3.2.2KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.18.1NambuliteLiMn2+4Si5O14(OH)Tric.
14.18.2Natronambulite(Na,Li)(Mn,Ca)4Si5O14OHTric.
14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
14.18.4NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
14.18.5ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2OTrig.
14.18.6AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.7Donpeacorite(Mn2+,Mg)Mg[SiO3]2Orth.
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
14.18.9CaryopiliteMn2+3Si2O5(OH)4Mon.
14.18.10Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8Orth.
14.18.11Tirodite
14.18.12Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
14.18.13BustamiteCaMn2+(Si2O6)Tric. 1 : P1
14.18.15Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
14.18.17FerrobustamiteCaFe2+(Si2O6)Tric.
14.18.18JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
14.18.19NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.20OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
14.18.21InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2OTric. 1 : P1
14.18.22OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth.
14.18.23RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2·2H2OMon. 2
14.18.24BostwickiteCaMn6Si3O16 · 7H2OOrth.
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
14.18.26LithiomarsturiteLiCa2Mn2Si5O14(OH)Tric.
14.18.27SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
14.18.28KvanefjelditeNa4(Ca,Mn)(Si3O7)2(OH)2Orth.
14.18.29MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
14.18.30RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
14.18.31Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.18.32Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2OOrth. mm2 : Ama2
14.18.33Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
14.18.34Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
14.18.35PyroxmangiteMnSiO3Tric. 1
14.18.36Dannemorite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1
14.18.39ManganbabingtoniteCa2(Mn,Fe)FeSi5O14(OH)Tric.
14.18.40ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.

Fluorescence of GlaucochroiteHide

Not fluorescent in UV

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.
Industrial Uses:
None.

Glaucochroite in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for GlaucochroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1978): 63: 930.
American Mineralogist (1987): 72: 423.
Science (1984): 223: 1075.

Internet Links for GlaucochroiteHide

Localities for GlaucochroiteHide

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.
Japan
 
  • Tochigi Prefecture
    • Kanuma City
Kato, A. (1991) Bulletin of the National Science Museum (Tokyo), 17, 119-128.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425.
Romania
 
  • Caraş-Severin
    • Banat Mountains
      • Oraviţa Skarns
Marincea, S., Dumitras, D. G., Ghinet, C., & Bilal, E. (2014, September). Superposed parageneses in the gehlenite-bearing, high-temperature skarns from Oraviţa (Banat, Romania). In IMA2014.
Russia
 
  • Murmansk Oblast
www.koeln.netsurf.de/~w.steffens/khib.htm
Chukanov, N. V. (2014), Infrared spectra of mineral species: Extended library. Springer Geochemistry / Mineralogy. 1726 pp.
South Africa
 
  • Northern Cape
    • Kalahari manganese field
      • Hotazel
Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) 279-302;
Sweden
 
  • Värmland County
    • Filipstad
      • Nordmark District
        • Jakobsberg ore field
USA (TL)
 
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Franklin
Palache (1935): 79; Dunn (1995): Pt3: 343.
 
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