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Mineralpedia Details for Montroydite

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Montroydite

Montroydite

Named in honor of Montroyd Sharpe, an owner of the mercury deposit at Terlingua in Texas, USA where Montryodite finds its type locality. Montryodite occurs in hydrothermal mercury deposits in localities in the United States, Mexico, and Kyrgyzstan as well as newer localities in Russia, Italy, and Belgium.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/montroydite.pdf

Formula
HgO 
Crystal System
Orthorhombic 
Crystal Habit
Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
red, brownish red, brown 
Streak
reddish orange 
Class
Orthorhombic - Dipyramidal 
Fracture
Sectile 
Hardness
1.5-2 
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Montroydite from Socrates mine, Sonoma Co., California, United States

Montroydite
            from Socrates mine, Sonoma Co., California, United States

Blood red tiny crystals to less than 0.2mm in vug about 7mm long.

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Montroydite from Aurora mine, San Benito Co., California, United States

Montroydite
            from Aurora mine, San Benito Co., California, United States

Rusty red blades less than 1mm in tiny vug.

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Montroydite from Terlingua dist., Brewster Co., Texas, United States

Montroydite
            from Terlingua dist., Brewster Co., Texas, United States
Special Info
Type Locality, XRD Confirmed

Without doubt this is an exceptional specimen with numerous, greater than 15, blood red Montroydite crystals. A few of the larger crystals are deeper red and almost glassy. The smaller crystals are superb also and seem to have curves and "bends" along the prism long axis. The Terlinguaite likewise is remarkable and exhibits a good yellowish green color and formless shapes, much like wax.

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

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

Tiny red acicular crystals less than 0.4mm directly associated with Mercury and greenish Edgarbaileyite. 

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