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Okayamalite

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Flag of Okayama Prefecture, Japan
Formula:
Ca2B(BSiO7)
Colour:
cream white
Lustre:
Earthy
Hardness:
Specific Gravity:
3.30 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named after Okayama Prefecture, Japan, which includes the type locality.
This page provides mineralogical data about Okayamalite.


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Classification of OkayamaliteHide

Approved
Approval Year:
1997
First Published:
1998
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 OkayamaliteHide

Earthy
Colour:
cream white
Streak:
white
Hardness:
5½ on Mohs scale
Cleavage:
None Observed
Density:
3.30 g/cm3 (Calculated)

Optical Data of OkayamaliteHide

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 OkayamaliteHide

Formula:
Ca2B(BSiO7)
IMA Formula:
Ca2B2SiO7

Crystallography of OkayamaliteHide

Crystal System:
Tetragonal

Type Occurrence of OkayamaliteHide

Place of Conservation of Type Material:
National Science Museum, Tokyo, under the registered number NSM M-27525.
Reference:
Matsubara, S., Miyawaki, R., Kato, A., Yokoyama, K., Okamoto, A. (1998) Okayamalite, Ca2B2SiO7, a new mineral, boron analogue of gehlenite. Mineralogical Magazine: 62: 703-706.

Synonyms of OkayamaliteHide

Other Language Names for OkayamaliteHide

German:Okayamalit
Japanese:岡山石
Spanish:Okayamalita

Relationship of Okayamalite to other SpeciesHide

Member of:
Other Members of this group:
ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
GugiaiteCa2Be(Si2O7)Tet.
HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
Hydroxylgugiaite(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2Tet. 4 2m : P4 21m

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10GugiaiteCa2Be(Si2O7)Tet.
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm
9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon.

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 OkayamaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Matsubara, S., Miyawaki, R., Kato, A., Yokoyama, K., Okamoto, A. (1998) Okayamalite, Ca2B2SiO7, a new mineral, boron analogue of gehlenite. Mineralogical Magazine: 62: 703-706.
Jambor, J.L., Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 990-994.

Internet Links for OkayamaliteHide

Localities for OkayamaliteHide

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 (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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