General Information:
Chemical Formula:(Ca,Na2,K2)5Al10Si38O96·25(H2O)
Environment:Hydrothermal zeolite that generally occures in silica-rich environments in late states of granitic pegmatites and Si-rich basalts.
IMA Status:Approved IMA (Dana # Added)
Locality:Alpe di Siusi, Bolzano, Italy.
Name Origin:Named after Antonio D'Achiardi (1839-1902), Professor of Mineralogy, Universit di Pisa, Italy, who first described the mineral discovered by his son in a granitic pegmatite. The Na -dominant member of the dachiardite se
Physical Properties: Cleavage:[100] Perfect, [001] Perfect
Color:white, pink, or orange red.
Density:2.14 - 2.21, Average = 2.17
Diaphaniety:Transparent to translucent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Twinning Common - Crystals are usually twinned., Pseudo Octohedral - Crystals show an octohedral outline.
Hardness:4-4.5 - Between Fluorite and Apatite
Luster:Vitreous - Silky
Streak:white
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