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Tiettaite

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Big Photo

Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, JGW




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.HA.90

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
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
General Appearance of Type Material:rounded friable aggregates up to 1 cm, containing acicular hairs elongat [001] and flattened (100)
Place of Conservation of Type Material:Fersman Museum, Moscow, and the Kola Science Center, Apatity.
Year of Discovery:1993
Geological Setting of type material:Occurs in unweathered (subsurface) ultra-agpaitic pegmatites
Associated Minerals at type locality:
OrthoclaseNephelineSodaliteAegirineVilliaumite
NatriteRasvumitePhosinaite-(Ce)VuonnemiteAstrophyllite
ShcherbakoviteKazakoviteKoashviteErshoviteOlympite
OlympiteDjerfisheriteShafranovskite

Physical Properties of Tiettaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless
Hardness (Mohs):3
Hardness Data:Measured
Cleavage:Perfect
{100} and {010} cleavages
Fracture:Step-Like

Crystallography of Tiettaite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Cmcm {C2/m 2/c 21/m}
Cell Parameters:a = 29.77(1) Å, b = 11.03(2) Å, c = 17.111(5) Å
Ratio:a:b:c = 2.699 : 1 : 1.551
Unit Cell Volume:V 5,618.62 ų (Calculated from Unit Cell)
Comment:Cmc2, or C2mc
X-Ray Powder Diffraction:
d-spacingIntensity
10.38 (100)
4.516 (75)
3.220 (65)
3.097 (80)
2.972 (65)
2.773 (90)

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.HA.05Ertixiite
Na
 
2
Si
 
4
O
 
9
9.HA.10Kenyaite
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
 · 6H
 
2
O
9.HA.20Wawayandaite
Ca
 
6
Mn
 
2
BBe
 
9
Si
 
6
O
 
23
(OH,Cl)
 
15
9.HA.25Magbasite
KBa(Al,Sc)(Mg,Fe)
 
6
Si
 
6
O
 
20
F
 
2
9.HA.30Afanasyevaite
Ca
 
8
[Si
 
2
O
 
7
]OCl
 
2
9.HA.40Igumnovite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
2
Cl
 
4
9.HA.50Rudenkoite
Sr
 
3
(Al
 
3.5
Si
 
3.5
)O
 
10
(OH,O)
 
8
Cl
 
2
 · H
 
2
O
9.HA.55Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
9.HA.60Nagelschmidtite
Ca
 
7
(SiO
 
4
)
 
2
(PO
 
4
)
 
2
9.HA.65Caryochroite
(Na,Sr)
 
3
(Fe
3+
 
,Mg)
 
10
[(O,OH)
 
9
|Ti
 
2
Si
 
12
O
 
37
] · (H
 
2
O, O, OH)
 
17
9.HA.70Juanite
Ca
 
10
Mg
 
4
Al
 
2
Si
 
11
O
 
39
 · 4H
 
2
O or near
9.HA.75Tacharanite
Ca
 
12
Al
 
2
Si
 
18
O
 
51
 · 18H
 
2
O
9.HA.80Oyelite
Ca
 
10
Si
 
8
B
 
2
O
 
29
 · 12.5H
 
2
O
9.HA.85Denisovite
Ca
 
2
(K,Na)Si
 
3
O
 
8
(F,OH)
 
2

Other Names for Tiettaite

Synonyms:
IMA1991-013
Other Languages:
German:Tiettait
Spanish: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
  • American Mineralogist Crystal Structure Database
  • Tiettaite details from Handbook of Mineralogy (PDF)
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    • Localities for Tiettaite

    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
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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