Stilbite (Desmin)

Stilbite, Chalcedony

Nashik District (Nasik District), Maharashtra, India

Item-No.: MIN5807
Price: 67.00 EUR 

Synonyms:  Desmine, Epidesmine, Garbenstilbite, Puferite
IMA Status:  Not recognize.  The name now refers to the minerals Stilbite-Ca and Stilbite-Na  
Classification:  Silicates, Tektosilicates, Zeolite Group
Chemical formula:  Stilbite-Ca: NaCa4(Si27Al9)O72 • 28 H2O
Chemical formula:  Stilbite-Na: Na9(Si27Al9)O72 • 28 H2O
Crystal system:  monoclinic
Density (g/cm3):  2,18 - 2,2 measured, 2,23 calculated
Cleavage:  Perfect on {010} indistinct on {100}
Fracture:  Irregular/uneven, sub-conchoidal
Hardness (Mohs):  3,5 - 4
Colour:  Colourless, white, pink, yellowish, orange, rose, brownish, grey
Lustre:  Vitreous, Pearly
Streak:  White