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Tiettaite

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Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, J. Weissman

Formula:
(Na,K)
 
17
FeTiSi
 
16
O
 
29
(OH)
 
30
·2H
 
2
O
System:OrthorhombicColour:Colourless
Hardness:3
Name:From Lappish "tietta", science or knowledge. Tietta is also the name for the first scientific station of the USSR Academy of Science in Khibiny.
This page provides mineralogical data about Tiettaite.

Classification of Tiettaite

IMA status:Approved 1991
Strunz 8th edition ID:8/D.16-30
Nickel-Strunz 10th (pending) edition ID:9.DQ.25

9 : SILICATES (Germanates)
D : Inosilicates
Q : Unclassified inosilicates
Dana 8th edition ID:78.6.4.1

78 : Unclassified Silicates
6 :
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Type Occurrence of Tiettaite

Co-type Localities:Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1993

Physical Properties of Tiettaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless
Hardness (Mohs):3

Crystallography of Tiettaite

Crystal System:Orthorhombic
Cell Parameters:a = 29.77Å, b = 11.03Å, c = 17.11Å
Ratio:a:b:c = 2.699 : 1 : 1.551
Unit Cell Volume:V 5,618.29 ų (Calculated from Unit Cell)

Optical Data of Tiettaite

Type:Biaxial (-)
RI values: nα = 1.530 - 1.532 nβ = 1.548 - 1.549 nγ = 1.559
2V:Measured: 79° , Calculated: 74°
Maximum Birefringence:δ = 0.029

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r < v moderate

Chemical Properties of Tiettaite

Formula:
(Na,K)
 
17
FeTiSi
 
16
O
 
29
(OH)
 
30
·2H
 
2
O
Essential elements:Fe, H, Na, O, Si, Ti
All elements listed in formula:Fe, H, K, Na, O, Si, Ti
Common Impurities:Ca

Relationship of Tiettaite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DQ.05Fukalite
Ca
 
4
[CO
 
3
|(HSiO
 
4
)
 
2
]
9.DQ.10Tacharanite
Ca
 
12
Al
 
2
Si
 
18
O
 
51
·18H
 
2
O
9.DQ.15Oyelite
Ca
 
10
Si
 
8
B
 
2
O
 
29
·12.5H
 
2
O
9.DQ.20Denisovite
Ca
 
2
(K,Na)Si
 
3
O
 
8
(F,OH)
 
2

Other Names for Tiettaite

Synonyms:
IMA1991-013
German names:
Tiettait
Spanish names:
Tiettaita

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 Tiettaite

Reference List:Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1993), 122(1): 121-125.

Canadian Mineralogist (1998): 36: 1305-1310.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Tiettaite

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  • Raman and XRD data at RRUFF project
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  • Tiettaite details from Handbook of Mineralogy (PDF)
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    Localities for Tiettaite

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    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    Mineral and/or Locality
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