Global InformationTuperssuatsiaite information
| Tuperssuatsiaite | |
|---|---|
 Tuperssuatsiaite from the Aris Quarries, Namibia. Field of view 5 mm. | |
| General | |
| Category | Phyllosilicate |
| Formula (repeating unit) | NaFe3+3Si8O20(OH)2·H2O[1] |
| IMA symbol | Tup[2] |
| Strunz classification | 9.EE.20 |
| Dana classification | 74.3.1a.2 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Unit cell | a = 13.72 Å, b = 18 Å c = 4.82 Å; β = 104.28°; Z = 2 |
| Identification | |
| Formula mass | 818.31 g/mol |
| Color | Dark to light red-brown |
| Crystal habit | Fan-shaped aggregates, rosettes or fibers |
| Twinning | Common |
| Cleavage | Good on {100} |
| Fracture | Uneven to conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | Not determined |
| Luster | Vitreous |
| Streak | Brownish yellow |
| Diaphaneity | Transparent |
| Specific gravity | 2.465 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.539, nβ = 1.560, nγ = 1.595 |
| Birefringence | δ = 0.056 |
| Pleochroism | Colorless to yellowish brown or reddish brown |
| 2V angle | Measured: 103° to 103°, Calculated: 78° |
| Other characteristics | Neither radioactive[3] nor fluorescent[4] |
| References | [3][5][6][7] |
Tuperssuatsiaite is a rare clay mineral found in Greenland, Namibia and Brazil. It is a hydrated phyllosilicate (sheet silicate) of sodium and iron.
- ^ Mineral list
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b "Tuperssuatsiaite Mineral Data". www.webmineral.com.
- ^ Dunn et al (1985) summarising Karup-Moller and Petersen( 1984) Neues Jahrbuch Mineral Monatsh: 501. American Mineralogist 70: 1332
- ^ Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley
- ^ "Tuperssuatsiaite". www.mindat.org.
- ^ Handbook of Mineralogy