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Koashvite

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Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Knut Eldjarn

Formula:
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
·H
 
2
O
System:OrthorhombicHardness:6
This page provides mineralogical data about Koashvite.

Classification of Koashvite

IMA status:Approved
Strunz 8th edition ID:8/E.16-50
Nickel-Strunz 10th (pending) edition ID:9.CJ.20

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
Dana 8th edition ID:61.1.2b.2

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Hey's CIM Ref.:14.9.38

14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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Type Occurrence of Koashvite

Type Locality:Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1974

Physical Properties of Koashvite

Hardness (Mohs):6

Crystallography of Koashvite

Crystal System:Orthorhombic
Cell Parameters:a = 10.17Å, b = 20.89Å, c = 7.33Å
Ratio:a:b:c = 0.487 : 1 : 0.351
Unit Cell Volume:V 1,557.27 ų (Calculated from Unit Cell)

Optical Data of Koashvite

Type:Biaxial (-)
RI values: nα = 1.637 nβ = 1.643 nγ = 1.648
2V:Measured: 82° to 84°, Calculated: 84°
Maximum Birefringence:δ = 0.011

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

Chemical Properties of Koashvite

Formula:
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
·H
 
2
O
Essential elements:Ca, H, Na, O, Si, Ti
All elements listed in formula:Ca, Fe, H, Mn, Na, O, Si, Ti
Common Impurities:Mg,K

Relationship of Koashvite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.CJ.05Bazzite
Be
 
3
Sc
 
2
Si
 
6
O
 
18
9.CJ.05Beryl
Be
 
3
Al
 
2
Si
 
6
O
 
18
9.CJ.05Indialite
Mg
 
2
Al
 
4
Si
 
5
O
 
18
9.CJ.05Stoppaniite
(Fe,Al,Mg)
 
4
(Na,[ ])
 
2
[Be
 
6
Si
 
12
O
 
36
]·2(H2O)
9.CJ.05Pezzottaite
Cs(Be
 
2
Li)Al
 
2
Si
 
6
O
 
18
9.CJ.10Cordierite
(Mg,Fe)
 
2
Al
 
4
Si
 
5
O
 
18
9.CJ.10Sekaninaite
(Fe,Mg)
 
2
Al
 
4
Si
 
5
O
 
18
9.CJ.15Combeite
Na
 
2
Ca
 
2
Si
 
3
O
 
9
9.CJ.15Kazakovite
Na
 
6
Ti[Si
 
6
O
 
16
(OH)
 
2
]
9.CJ.15Lovozerite
(Na,Ca)
 
3
(Zr,Ti)[Si
 
6
(O,OH)
 
18
]
9.CJ.15Tisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
·2H
 
2
O
9.CJ.15Zirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr[Si
 
6
O
 
18
]
9.CJ.15Litvinskite
Na
 
2
([],Na,Mn)ZrSi
 
6
O
 
12
(OH,O)
 
6
9.CJ.15Kapustinite
Na
 
5
(Na,Mn
2+
 
)
 
<1
Zr[Si
 
6
O
 
16
(OH)
 
2
]
9.CJ.20Imandrite
Na
 
12
Ca
 
3
Fe
3+
2
[Si
 
6
O
 
18
]
 
2
9.CJ.25Baratovite
KCa
 
7
(Ti,Zr)
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
9.CJ.25Katayamalite
KCa
 
7
Ti
 
2
Li
 
3
Si
 
12
O
 
36
(OH)
 
2
9.CJ.30Dioptase
CuSiO
 
2
(OH)
 
2
9.CJ.35Kostylevite
K
 
2
ZrSi
 
3
O
 
9
·H
 
2
O
9.CJ.40Petarasite
Na
 
5
Zr
 
2
[(OH,Cl)|Si
 
6
O
 
18
]·2H
 
2
O
9.CJ.45Gerenite-(Y)
(Ca,Na)
 
2
(Y,REE)
 
3
Si
 
6
O
 
18
·2H
 
2
O
9.CJ.50Odintsovite
K
 
2
Na
 
4
Ca
 
3
Ti
 
2
Be
 
4
Si
 
12
O
 
38
9.CJ.55Mathewrogersite
Pb
 
7
(Fe
2+
 
,Cu)Al
 
3
Ge[(OH,H
 
2
O)
 
6
|(Si
 
3
O
 
9
)
 
4
]
Related Minerals - Hey's Index Grouping:
14.9.1Natisite
Na
 
2
Ti[O|SiO
 
4
]
14.9.2Lorenzenite
Na
 
2
Ti
 
2
[O
 
3
|Si
 
2
O
 
6
]
14.9.3Lintisite
LiNa
 
3
Ti
 
2
[O|Si
 
2
O
 
6
]
 
2
 · 2H
 
2
O
14.9.4Davanite
K
 
2
TiSi
 
6
O
 
15
14.9.5Kazakovite
Na
 
6
Ti[Si
 
6
O
 
16
(OH)
 
2
]
14.9.6Titanite
CaTi[O|SiO
 
4
]
14.9.7Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)[(O,OH)|(Si
 
2
O
 
6
)
 
2
] · 2-3H
 
2
O
14.9.8Lamprophyllite
(Sr,K,Ba)
 
2
(Na,Ti,Mn
2+
 
,Fe
3+
 
)
 
4
Ti
 
2
[O|(O,OH,F)|Si
 
2
O
 
7
]
 
2
14.9.9Benitoite
BaTi[Si
 
3
O
 
9
]
14.9.10Batisite
Na
 
2
BaTi
 
2
[O|Si
 
2
O
 
6
]
 
2
14.9.11Fresnoite
Ba
 
2
Ti[O|Si
 
2
O
 
7
]
14.9.12Joaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(OH,F) · H
 
2
O
14.9.13Orthojoaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(O,OH) · H
 
2
O
14.9.14Strontiojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
14.9.15Bario-orthojoaquinite
(Ba,Sr)
 
4
Fe
 
2
Ti
 
2
Si
 
8
O
 
26
·H
 
2
O
14.9.16Strontio-orthojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
14.9.17Bafertisite
Ba(Fe
3+
 
,Mn
2+
 
)
 
2
Ti[O|(O,OH)
 
2
|Si
 
2
O
 
7
]
14.9.18Hejtmanite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Ti[O|(OH,F)
 
2
|Si
 
2
O
 
7
]
14.9.19Delindeite
(Na,K)
 
2.7
(Ba,Ca)
 
4
(Ti,Fe,Al)
 
6
Si
 
8
O
 
26
(OH)
 
14
14.9.20Barytolamprophyllite
(Ba,Na)
 
2
(Na,Ti,Fe
3+
 
)
 
4
Ti
 
2
[O|(OH,F)|Si
 
2
O
 
7
]
 
2
14.9.21Trimounsite-(Y)
Y
 
2
Ti
 
2
[O
 
5
|SiO
 
4
]
14.9.22Perrierite-(Ce)
(Ce,Ca,Th)
 
4
(Mg,Fe
2+
 
)
 
2
(Ti,Fe
3+
 
)
 
3
[O
 
4
|Si
 
2
O
 
7
]
 
2
14.9.23Chevkinite
(Ca,Ce,Th)
 
4
(Fe,Mn)
 
2
(Ti,Fe)
 
3
Si
 
4
O
 
22
14.9.24Strontiochevkinite
(Sr,La,Ce,Ca)
 
4
Fe
3+
 
(Ti,Zr)
 
2
Ti
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
14.9.25Tisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
·2H
 
2
O
14.9.26Neptunite
Na
 
2
KLi(Fe
2+
 
,Mn
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
14.9.27Manganoneptunite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
14.9.28Kupletskite
(K,Na)
 
3
(Mn,Fe)
 
7
Ti
 
2
Si
 
8
O
 
26
(OH)
 
4
F
14.9.29Astrophyllite
(K,Na)
 
3
(Fe,Mn)
 
7
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
7
14.9.30Hydroastrophyllite
(H
 
3
O,K,Ca)
 
3
(Fe,Mn)
 
5-65
Ti
 
2
Si
 
8
(O,OH)
 
31
14.9.31Magnesioastrophyllite
(Na,K)
 
4
Mg
 
2
(Fe,Fe,Mn)
 
5
Ti
 
2
Si
 
8
O
 
24
(O,OH,F)
 
7
14.9.32Baratovite
KCa
 
7
(Ti,Zr)
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
14.9.34Aenigmatite
Na
 
2
Fe
2+
5
TiO
 
2
]Si
 
6
O
 
18
]
14.9.35Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
,Fe
2+
 
)O
 
4
]
 
3
14.9.36Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
14.9.37Janhaugite
(Na,Ca)
 
3
(Mn,Fe)
 
3
(Ti,Zr,Nb)
 
2
Si
 
4
O
 
15
(OH,F,O)
 
3

Other Names for Koashvite

Synonyms:
IMA1973-026
German names:
Koashvit
Spanish names:
Koashvita

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 Koashvite

Reference List:American Mineralogist (1975): 60: 487.

Mineralogicheskii Zhurnal (1980): 2(5): 40-44.

Internet Links for Koashvite

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    Localities for Koashvite

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    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.
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    (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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		[World of Stones 95:5-6, p64]
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