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Macdonaldite

#PD42220

Macdonaldite

#PD42220
Availability
Sold
Size
4.5 x 4 x 2 cm - Miniature 
Formula
BaCa4Si16O36(OH)2·10H2O (RRUFF)
Locality
Big Creek, Fresno Co., California, United States

Excellent coverage of rare Macdonaldite in acicular radial sprays to 2mm over altered Sanbornite matrix. It is associated with tiny crystal grains of Fresnoite. Outside of the metasomatized barium deposits of California, there is only one other world locality for Macdonaldite.

Type Locality

Macdonaldite

Formula
BaCa4Si16O36(OH)2·10H2
Crystal System
Orthorhombic 
Crystal Habit
Acicular 
Cleavage
Perfect, Good, Indistinct 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Type Locality

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