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Okayamalite

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Formula:
Ca
 
2
B(BSiO
 
7
)
System:TetragonalColour:cream white
Lustre:EarthyHardness:5½
Member of:Melilite Group
Name:Named after its type locality
This page provides mineralogical data about Okayamalite.

Classification of Okayamalite

IMA status:Approved 1997
Strunz 8th edition ID:8/C.02-14
Nickel-Strunz 10th (pending) edition ID:9.BB.10

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

Type Locality:Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan

Physical Properties of Okayamalite

Lustre:Earthy
Colour:cream white
Streak:white
Hardness (Mohs):5½
Cleavage:None Observed

Crystallography of Okayamalite

Crystal System:Tetragonal

Optical Data of Okayamalite

Type:Uniaxial (-)
RI values: nω = 1.700 nε = 1.670
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Okayamalite

Formula:
Ca
 
2
B(BSiO
 
7
)
Essential elements:B, Ca, O, Si
All elements listed in formula:B, Ca, O, Si

Relationship of Okayamalite to other Species

Member of:Melilite Group
Other Members of Group:

- +
Åkermanite
Ca
 
2
Mg(Si
 
2
O
 
7
)
Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
Gehlenite
Ca
 
2
Al(AlSiO
 
7
)
Gugiaite
Ca
 
2
Be(Si
 
2
O
 
7
)
Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg(Si
 
2
O
 
7
)
9.BB.10Cebollite
Ca
 
5
Al
 
2
(SiO
 
4
)
 
3
(OH)
 
4
9.BB.10Gehlenite
Ca
 
2
Al(AlSiO
 
7
)
9.BB.10Gugiaite
Ca
 
2
Be(Si
 
2
O
 
7
)
9.BB.10Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
9.BB.10Jeffreyite
(Ca,Na)
 
2
(Be,Al)(Si
 
2
O
 
7
,HSi
 
2
O
 
7
)
9.BB.10Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.15Clinobarylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.20Andrémeyerite
Fe
2+
2
Ba(Si
 
2
O
 
7
)

Other Names for Okayamalite

Synonyms:
IMA1997-002
Other Languages:
German:Okayamalit
Russian:Окаямалит
Spanish:Okayamalita

Other Information

Health Warning: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

Search Engines:
  • Look for Okayamalite on Google
  • Look for Okayamalite images on Google
    • External Links:
  • Look for Okayamalite on Webmineral
  • Look for Okayamalite on Athena Mineralogy
  • Look for Okayamalite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Wilensky Fine Minerals
  • Find Okayamalite on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • High-end worldwide specimens & outstanding customer service
  • The Arkenstone - Fine Minerals
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  • Search for minerals at Heliodor
  • Search for - Okayamalite - on e-Rocks Mineral Sales & Auctions
  • Fine Minerals from Weinrich Minerals, Inc.
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    • Localities for Okayamalite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi City
            • Bitchu-cho (Bicchu-cho)
    		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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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