| Inyoite | |
| Category: | Nesoborates |
| Formula: | CaB3O3(OH)5·4H2O |
| Imasymbol: | Iyo[1] |
| Strunz: | 6.CA.35 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/a |
| Unit Cell: | a = 10.63, b = 12.06 c = 8.4 [Å]; β = 114.03°; Z = 4 |
| Colour: | Colourless, white on dehydration. |
| Habit: | Commonly as prismatic to tabular crystals; also in cockscomb aggregates of pseudorhombohedral crystals; coarsely spherulitic or granular |
| Cleavage: | Good on, distinct on |
| Fracture: | Irregular/uneven |
| Tenacity: | Brittle |
| Mohs: | 2 |
| Lustre: | Vitreous |
| Refractive: | nα = 1.495 nβ = 1.505 – 1.512 nγ = 1.520 |
| Opticalprop: | Biaxial (−) |
| Birefringence: | Maximum δ = 0.025 |
| Dispersion: | Weak |
| Gravity: | 1.875 |
| References: | [2] [3] |
Inyoite, named after Inyo County, California, where it was discovered in 1914, is a colourless monoclinic mineral. It turns white on dehydration. Its chemical formula is Ca(HBO)(OH)·4HO or CaB3O3(OH)5·4H2O.[3] Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum.[2] [3]