Harmotome
Chemical Formula	(Ba0.5,Ca0.5,Na,K)5Al5,Si11O32·12(H2O)
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	4-5
Specific Gravity	2.5
Color	Colorless, white, grey, pink, yellow, brown
Streak	White
Luster	Vitreous
Refractive Index	n = 1.503 - 1.508 n = 1.505 - 1.509 n = 1.508 - 1.514
Diaphaneity	Transparent, Translucent
Cleavage	Distinct/GoodDistinct on , poor on
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Crystals elongate or tabular, frequently twinned.
Geological Setting：Cavities in basalts, phonolites, trachyites, gneisses and some hydrothermal veins.