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Mineralpedia Details for Eglestonite

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Eglestonite

Eglestonite

Formula
Hg1+6OCl3(OH) 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Adamantine - Resinous 
Color
brown, brownish yellow, yellow, dark brown, orange 
Streak
light yellow 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
2-3 
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Eglestonite from Cahill mine, Humboldt Co., Nevada, United States

Eglestonite
            from Cahill mine, Humboldt Co., Nevada, United States

Yellow alterations of Cinnabar throughout matrix.

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Eglestonite from McDermitt mine, Humboldt Co., Nevada, United States

Eglestonite
            from McDermitt mine, Humboldt Co., Nevada, United States
Special Info
XRD Confirmed

Bright mustard yellow coatings of Eglestonite (XRD) on faint yellowish crystal grains of Terlinguaite with Cinnabar.

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Eglestonite from Clear Creek mine, San Benito Co., California, United States

Eglestonite
            from Clear Creek mine, San Benito Co., California, United States

A glassy yellow, equant, very nice, Eglestonite crystals to about 0.5mm in quartz lined vug. 

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