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Okayamalite

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Formula:
Ca2B2SiO7
System:
Tetragonal
Colour:
cream white
Lustre:
Earthy
Hardness:
Member of:
Name:
Named after its type locality
This page provides mineralogical data about Okayamalite.


Classification of Okayamalite

Approved
Approval Year:
1997
9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination

Physical Properties of Okayamalite

Earthy
Colour:
cream white
Streak:
white
Hardness (Mohs):
Cleavage:
None Observed

Optical Data of Okayamalite

Type:
Uniaxial (-)
RI values:
nω = 1.700 nε = 1.670
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Okayamalite

IMA Formula:
Ca2B2SiO7
Elements listed in formula:

Crystallography of Okayamalite

Crystal System:
Tetragonal

Type Occurrence of Okayamalite

Relationship of Okayamalite to other Species

Member of:
Other Members of Group:
ÅkermaniteCa2Mg(Si2O7)
Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)
GugiaiteCa2Be(Si2O7)
HardystoniteCa2Zn(Si2O7)
Hydroxylgugiaite(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2
9.BB.10ÅkermaniteCa2MgSi2O7
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4
9.BB.10GehleniteCa2Al(SiAl)O7
9.BB.10GugiaiteCa2BeSi2O7
9.BB.10HardystoniteCa2ZnSi2O7
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)Si2(O,OH)7
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
9.BB.15BaryliteBaBe2Si2O7
9.BB.15Barylite-1OBe2Ba(Si2O7)
9.BB.20AndrémeyeriteBaFe22+Si2O7

Other Names for Okayamalite

Name in Other Languages:
German:Okayamalit
Japanese:岡山石
Spanish:Okayamalita

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.

References for Okayamalite

Reference List:
Mineralogical Magazine (1998): 62: 703-706.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Okayamalite

mindat.org URL:
https://www.mindat.org/min-7202.html
Please feel free to link to this page.

Localities for Okayamalite

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 (TL)
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Mineralogical Magazine (1998): 62: 703-706.
Norway
 
  • Aust-Agder
    • Arendal
Olmi, F., Viti, C., Bindi, L., Bonazzi, P. & Menchetti, S. (2000): Second occurrence of okayamalite, Ca2SiB2O7: chemical and TEM characterization. American Mineralogist.
Mineral and/or Locality  
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