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Glaucochroite

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

Classification of Glaucochroite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 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
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First Recorded Occurrence of Glaucochroite

General Appearance of First Recorded Material:
Massive material in franklinite-willemite-zincite ore with hardystonite and calcite.
Year of Discovery:
1899

Physical Properties of Glaucochroite

Vitreous, Resinous
Diaphaneity (Transparency):
Opaque
Colour:
Bluish-grey, pink, brown or white.
Hardness (Mohs):
6
Cleavage:
None Observed

Crystallography of Glaucochroite

Crystal System:
Orthorhombic
Cell Parameters:
a = 4.92Å, b = 11.14Å, c = 6.5Å
Ratio:
a:b:c = 0.442 : 1 : 0.583
Unit Cell Volume:
V 356.26 ų (Calculated from Unit Cell)

Optical Data of Glaucochroite

Type:
Biaxial (-)
RI values:
nα = 1.679 - 1.686 nβ = 1.716 - 1.723 nγ = 1.729 - 1.736
2V:
Measured: 61° , Calculated: 60°
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

Chemical Properties of Glaucochroite

Formula:
CaMn2+SiO4
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Zn,Pb,Mg

Relationship of Glaucochroite to other Species

Member of:
Other Members of Group:
Calcio-olivineCa2SiO4
FayaliteFe22+SiO4
ForsteriteMg2SiO4
KirschsteiniteCaFe2+SiO4
LaihuniteFe2+Fe23+(SiO4)2
Liebenbergite(Ni,Mg)2SiO4
MonticelliteCaMgSiO4
Olivine(Mg,Fe2+)2SiO4
Roepperite (of Brush)(Fe22+,Mn,Zn)SiO4
TephroiteMn22+SiO4
9.AC.05FayaliteFe22+SiO4
9.AC.05ForsteriteMg2SiO4
9.AC.05KirschsteiniteCaFe2+SiO4
9.AC.05LaihuniteFe2+Fe23+(SiO4)2
9.AC.05Liebenbergite(Ni,Mg)2SiO4
9.AC.05TephroiteMn22+SiO4
9.AC.10MonticelliteCaMgSiO4
9.AC.15BrunogeieriteFe22+Ge4+O4
9.AC.15Ringwoodite(Mg,Fe2+)2SiO4
9.AC.20ChesnokoviteNa2[SiO2(OH)2] · 8H2O
14.18.1Nambulite(Li,Na)Mn4Si5O14(OH)
14.18.2Natronambulite(Na,Li)(Mn,Ca)4Si5O14OH
14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2O
14.18.4NorrishiteKLiMn23+(Si4O10)O2
14.18.5Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2O
14.18.6AbswurmbachiteCuMn63+(SiO4)O8
14.18.7Donpeacorite(Mn2+,Mg)Mg[SiO3]2
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6
14.18.9Caryopilite(Mn,Mg)3(Si2O5)(OH)4
14.18.10Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
14.18.11Tirodite
14.18.12Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
14.18.13BustamiteCaMn2+(Si2O6)
14.18.15Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
14.18.17FerrobustamiteCaFe2+(Si2O6)
14.18.18JohannseniteCaMn2+Si2O6
14.18.19NeltneriteCaMn63+(SiO4)O8
14.18.20OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2O
14.18.21InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
14.18.22OrientiteCa2Mn2+Mn23+(Si3O10)(OH)4
14.18.23RuiziteCa2Mn23+[(OH)2|H2Si4O13] · 2H2O
14.18.24BostwickiteCaMn6Si3O16 · 7H2O
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2O
14.18.26LithiomarsturiteLiCa2Mn2Si5O14(OH)
14.18.27SéranditeNa(Mn2+,Ca)2(HSi3O9)
14.18.28KvanefjelditeNa4(Ca,Mn)(Si3O7)2(OH)2
14.18.29MarsturiteNaCaMn3Si5O14(OH)
14.18.30RaiteNa4Mn32+Ti0.25Si8O20(OH)2 · 10H2O
14.18.31Richterite{Na}{CaNa}{Mg5}(Si8O22)(OH)2
14.18.32Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O
14.18.33Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5
14.18.34Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
14.18.35PyroxmangiteMnSiO3
14.18.36Dannemorite
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2O
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
14.18.39ManganbabingtoniteCa2(Mn,Fe)FeSi5O14(OH)
14.18.40ÖrebroiteMn32+(Sb5+,Fe3+)(SiO4)(O,OH)3

Other Names for Glaucochroite

Other Information

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.

References for Glaucochroite

Reference List:
American Mineralogist (1978): 63: 930.

American Mineralogist (1987): 72: 423.

Science (1984): 223: 1075.

Internet Links for Glaucochroite

Localities for Glaucochroite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Japan
 
  • Honshu Island
    • Kanto Region
      • Tochigi Prefecture
        • Kanuma City
Kato, A. (1991) Bulletin of the National Science Museum (Tokyo), 17, 119-128.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
www.koeln.netsurf.de/~w.steffens/khib.htm
South Africa
 
  • Northern Cape Province
    • 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
    • Filipstad
      • Nordmark district
        • Jakobsberg ore field
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Palache (1935): 79; Dunn (1995): Pt3: 343.
Mineral and/or Locality  
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