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Okayamalite

Formula:
Ca
 
2
B[BSiO
 
7
]
System:TetragonalColour:cream white
Lustre:EarthyHardness:5½
Name:Named after its type locality


Melilite Group.

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, 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

Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg[Si
 
2
O
 
7
]
9.BB.10Cebollite
Ca
 
5
Al
 
2
Si
 
3
O
 
12
(OH)
 
4
 or near
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
 
6
(O,OH)]
9.BB.10IMA2008-049
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
9.BB.15Clinobarylite
BaBe
 
2
Si
 
2
O
 
7
9.BB.20Andrémeyerite
BaFe
2+
2
[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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    Localities for Okayamalite

    (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
            • Bitchu-cho (Bicchu-cho)
    		Mineralogical Magazine (1998): 62: 703-706.
    Norway
     
    • Aust-Agder
    		Am. Min. (2000) 85, 1508–1511
    Mineral and/or Locality
    Google
     
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