| Malayaite | |
|---|---|
 Malayaite found in the United Kingdom | |
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | CaSnO[SiO4] |
| IMA symbol | Mly[1] |
| Strunz classification | 9.AG.15 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | A2/a |
| Unit cell | a = 7.15 Å, b = 8.90 Å, c = 6.67 Å; β = 113.4°; V = 389.50 Å3; Z = 4 |
| Identification | |
| Formula mass | 266.87 g/mol |
| Color | Colorless, greenish gray, white, light yellow, orange |
| Crystal habit | Massive or wedge shaped |
| Mohs scale hardness | 3.5 - 4 |
| Luster | Vitreous or resinuous |
| Streak | White |
| Diaphaneity | Translucent |
| Specific gravity | 4.3 - 4.55 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.765 nβ = 1.784 nγ = 1.799 |
| Birefringence | δ=0.0340-0.0350 |
| Pleochroism | x=colorless, y=colorless, z = pale yellow |
| Other characteristics | Fluorescent, Short UV = bright yellowish green |
| References | [2][3][4][5] |
Malayaite is a calcium tin silicate mineral with formula CaSnOSiO4.[3] It is a member of the titanite group.
- ^ 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.
- ^ Mindat
- ^ a b WebMineral
- ^ Handbook of Mineralogy
- ^ Higgins, J.B., and Ribbe, P.H., (1977) The Structure of Malayaite CaSnOSiO4, a tin analog of Titanite, American Mineralogist, 62, 801-806.