Tatarskite

Ca6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
IMA status
  • Approved
IMA symbol
Tts
Discovered
1963
Also known as
  • Tatarskiet

Where it forms, where it's found

Geological setting

Secondary mineral from marine salt deposit

Type locality
Chelkar salt dome
  1. Aksai Valley
  2. Terekti District
  3. West Kazakhstan Region
  4. Kazakhstan

50.4667°, 51.6833°

2recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789102.5/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Transparent
Colour
Colourless to very pale yellow.
Cleavage
Distinct/Good

Two sets of distinct pinacoidal cleavages

Density
2.341 g/cm³

Optical

Optical type
Biaxial (-) · 2V measured = 83° · 2V calc = 83°
Refractive index
1.567 – 1.722
Surface relief
Moderate
Principal indices
nα 1.567 · nβ 1.654 · nγ 1.722
Dispersion
r > v strong
Michel-Lévy diagramhighlighted lineδ = 0.1550
Attainable Michel-Lévy rangeΔ ∈ [0, t·δmax]1550 nm3rd order
Δ = 0Δmax
Thin-section mosaic70 grains · random 3D orientations
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
Interference simulatorsingle grain · PPL ↔ XPL
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation1550 nm
Order3rd order
XPL colour

Crystallography

Crystal system
Orthorhombic
Morphology

coarsely crystalline masses, to 3 cm.

Type-locality form

coarsely crystalline masses, to 3 cm.

Comment

Point Group: n.d.; Space Group: n.d. Z = n.d.

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen2515.999399.975
42.68%
20CaCalciumCalcium640.078240.468
25.66%
17ClChlorineChlorine435.450141.800
15.13%
16SSulfurSulfur232.06064.120
6.84%
12MgMagnesiumMagnesium224.30548.610
5.19%
6CCarbonCarbon212.01124.022
2.56%
1HHydrogenHydrogen181.00818.144
1.94%
Total937.139100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Tatarskiet

In other languages

German
Tatarskit
Italian
Tatarskite
Chinese
水硫碳钙镁石

Classification

Strunz
10th ed.

7.DG.25

  • 7SulfatesClass
  • 7.DSulfates (selenates, etc.) with additional anions, with H2ODivision
  • 7.DGWith large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3Group
  • 7.DG.25TatarskiteSpecies
Dana
8th ed.

32.04.02.01

  • 32Compound SulfatesClass
  • 32.04Hydrated Compound Sulfates containing Hydroxyl or HalogenType
  • 32.04.02— unnamed intermediate level —Group
  • 32.04.02.01TatarskiteSpecies
CIM

12.2.9

  • 12Carbonates with other anionsClass
  • 12.2Carbonates with sulphateGroup
  • 12.2.9TatarskiteSpecies

Literature, links & citation

Citations
  1. 1963Lobanova, V.V. (1963) The new mineral tatarskite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 92(6): 697-702.
  2. 1964Fleischer, M. (1964) New Mineral Names. American Mineralogist, 49 (7-8) 1151-1154
  3. 1967IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20 DOI: 10.1180/minmag.1967.036.277.20
  4. 2005(2005) Tatarskite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Tatarskite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/tatarskite-3894},
  note      = {Accessed 2026-05-11}
}