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Saamite

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The Sámi flag
Formula:
Ba☐Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2
Colour:
Colorless to very pale tan
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.243 (Calculated)
Crystal System:
Triclinic
Name:
Named after the Saami (Саами in Cyrillic) indigenous people who inhabit parts of the Kola Peninsula of Russia, far northern Norway, Sweden, and Finland.
Chemically and topologically related to kazanskyite, nechelyustovite and bornemanite. Also chemically similar to bykovaite and tazzoliite.
Not to be confused with Saamite (of Volkova & Melentiev).

Group-III TS-block Ti-disilicate, that is, contains TS block built of HOH layers (H = heteropolyhedral layer, O = octahedral layer), and Ti+Nb+Mg = 3 apfu.

Crystal structure details:
The O sheet: Na- and Ti-dominant octahedra, Na3Ti ideal composition.
H sheets: with disilicate groups link to polyhedra with (1) [5]Ti and (2)[6]Nb.
Two peripheral sites: (1) [10]AP(1), (Ba,Sr,K), 94% occupancy, and (2) [8]AP(2), Ca, 26% occupancy.
Adjacent TS blocks connect via (1) hydrogen bonds, water-water and H2O–O (2) via a layer of Ba atoms that form the I (intermediate) block.


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Classification of SaamiteHide

Approved
Approval Year:
2013

Physical Properties of SaamiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless to very pale tan
Streak:
White
Hardness:
Cleavage:
Perfect
On {001}
Fracture:
Irregular/Uneven
Density:
3.243 g/cm3 (Calculated)

Optical Data of SaamiteHide

Type:
Biaxial (+)
RI values:
nα = 1.760 nβ = 1.770 nγ = 1.795
2V:
Measured: 69° (2), Calculated: 65°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Medium dispersion, r > v
Pleochroism:
Non-pleochroic

Chemical Properties of SaamiteHide

Formula:
Ba☐Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2
IMA Formula:
Ba◻TiNbNa3Ti(Si2O7)2O2(OH)2(H2O)2
Common Impurities:
Sr,K,Ca,Mn

Crystallography of SaamiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 5.437(2) Å, b = 7.141(3) Å, c = 21.69(1) Å
α = 92.97(1)°, β = 96.07(7)°, γ = 90.01(1)°
Ratio:
a:b:c = 0.761 : 1 : 3.037
Unit Cell V:
836.3 ų
Z:
2
Morphology:
Platy crystals

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.180(11)
3.077(13)
2.887(9)
2.865(11)
2.790(15)
2.692(14)
1.785(9)
Comments:
From Type Description.

Type Occurrence of SaamiteHide

General Appearance of Type Material:
Transparent platy crystals 2–10 μm thick and up to 180 μm across.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, catalogue numbers 4432/1 and 4432/2
Geological Setting of Type Material:
Hydrothermally altered pegmatite in nepheline syenite.
Associated Minerals at Type Locality:

Synonyms of SaamiteHide

Fluorescence of SaamiteHide

not observed

Other InformationHide

IR Spectrum:
~1605, 1645, ~1747, and ~3420 cm-1
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SaamiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cámara, F., Sokolova, E. and Hawthorne, F.C. (2013) Saamiite, IMA 2013- 083. CNMNC Newsletter No. 18, December 2013, page 3254; Mineralogical Magazine, 77, 3249-3258.
Cámara, F., Sokolova, E., Abdu, Y.A., Hawthorne, F.C. (2014): Saamite, Ba□TiNbNa3Ti(Si2O7)2O2(OH)2(H2O)2, a Group-III Ti-disilicate mineral from the khibiny Alkaline Massif, Kola Peninsula, Russia: Description and crystal structure. Canadian Mineralogist, 52, 745-762

Internet Links for SaamiteHide

Localities for SaamiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
        • Kukisvumchorr Mt
Cámara, F., Sokolova, E. and Hawthorne, F.C. (2013) Saamiite, IMA 2013- 083. CNMNC Newsletter No. 18, December 2013, page 3254; Mineralogical Magazine, 77, 3249-3258. ; Cámara, F., Sokolova, E., Abdu, Y.A., Hawthorne, F.C. (2014): Saamite, Ba□TiNbNa3Ti(Si2O7)2O2(OH)2(H2O)2, a Group-III Ti-disilicate mineral from the khibiny Alkaline Massif, Kola Peninsula, Russia: Description and crystal structure. Canadian Mineralogist, 52, 745-762
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