21 Photos
Inyoite
Chemical Formula	Ca(H4B3O7)(OH)·4(H2O)
Species	Borates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	1.875
Color	Colourless, turning white upon partial dehydration; colourless in transmitted light
Luster	Vitreous
Refractive Index	n = 1.495 n = 1.505 - 1.512 n = 1.520
Diaphaneity	Transparent
Cleavage	Distinct/GoodOn good; on quality unstated.
Fracture	Irregular/Uneven
Crystal Habit：Commonly as prismatic to tabular crystals; also in cockscomb aggregates of pseudorhombohedral crystals; coarsely spherulitic or granular

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(H₄B₃O₇)(OH)·4(H₂O) or CaB₃O₃(OH)₅·4(H₂O).