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Mineralpedia Details for Macdonaldite

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Macdonaldite

Macdonaldite

Formula
BaCa4Si16O36(OH)2ยท10H2
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 
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Macdonaldite from Esquire #8 claim, Big Creek, Fresno Co., California, United States

Macdonaldite
            from Esquire #8 claim, Big Creek, Fresno Co., California, United States
Special Info
Type Locality

Brown veins of Pellyite with white acicular and silky groups of Macdonaldite. Macdonaldite is a rather rare barium silicate found only in Italy and California. This being the Type Locality. This can be considered a good specimen. 

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Macdonaldite from Big Creek, Fresno Co., California, United States

Macdonaldite
            from Big Creek, Fresno Co., California, United States
Special Info
Type Locality

A small specimen from Big Creek, the type locality. Acicular radiating sprays to about 1mm.

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Macdonaldite from Esquire #1 claim, Rush Creek, Fresno Co., California, United States

Macdonaldite
            from Esquire #1 claim, Rush Creek, Fresno Co., California, United States
Special Info
Type Locality

A superb specimen of glassy, white, acicular Macdonaldite in divergent sprays to 5mm. 

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