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Yugawaralite on Calcite

#PD34650

Yugawaralite on Calcite

#PD34650
Availability
Sold
Size
8 x 5.5 x 4 cm - Sm Cabinet 
Formula
CaAl2Si6O16 ²4H2O (RRUFF)
Locality
Midsandur, Iceland
Tagged
zeolite

The locality is vague, is probably the nearest port or town near the actual deposit. The specimen is loaded with colorless, murky, long, flat tabular or bladed crystals to 2mm associated with equant Calcite crystals.  One look at the locality review on Mindat and you can conclude the mineral forms in active geothermal environments. A rare zeolite.

Yugawaralite

Formula
Ca(Si6Al2)O16·4H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Domatic 
Fracture
Brittle 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

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