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Mineralpedia Details for Hemimorphite

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Hemimorphite

Hemimorphite

Named in reference to the mineral’s hemimorphic morphology as having different crystalline forms at the end of each of its crystallographic axes. Hemimorphite is relatively common and forms as a secondary mineral in oxidized zinc-rich mineral deposits. Localities for good material are in Romania, Slovakia, England, Belgium, Germany, Russia, Iran, the United States, and Mexico, and there are many other additional localities. Hemimorphite is strongly pyroelectric, generates a charge in response to heat, and can also fluoresce a blue color under short-wave ultraviolet light.

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

Formula
Zn4Si2O7(OH)2·H2
Crystal System
Orthorhombic 
Crystal Habit
Massive, Stalactitic, Mammillary 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, greenish gray, yellow brown, white 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Conchoidal 
Hardness
WebMineral
View Hemimorphite 
Mindat
View Hemimorphite 

Hemimorphite from Wenshan mine, Yunnan Province, China

Hemimorphite
            from Wenshan mine, Yunnan Province, China Large botryoids to about 5-6mm covering 95% of the face. A vibrant blue color with a flat luster.
Click thumbnail images for larger view.

Hemimorphite from Mina Ojuela, Mapimi, Durango, Mexico

Hemimorphite
            from Mina Ojuela, Mapimi, Durango, Mexico

Clear to white, bladed and divergent crystals to 3mm on lime green Conichalcite and 1cm waterclear and bladed crystals to 1cm with yellow Mimetite.

Click thumbnail images for larger view.

Hemimorphite from Bunker Hill mine, Shoshone Co., Idaho, United States

Hemimorphite
            from Bunker Hill mine, Shoshone Co., Idaho, United States

Clear to white, bladed crystals to 4mm in radial aggregates to 8mm.

Click thumbnail images for larger view.

Hemimorphite from San Rafael mine, Nye Co., Nevada, United States

Hemimorphite
            from San Rafael mine, Nye Co., Nevada, United States

A 4cm cavity filled with radial sprays of Hemimorphite crystals to 3mm.

Click thumbnail images for larger view.

Hemimorphite from Friedensville mine, Lehigh Co., Pennsylvania, United States

Hemimorphite
            from Friedensville mine, Lehigh Co., Pennsylvania, United States

Spherical aggregates to 8mm of white to dirty light brown Hemimorphite.

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Hemimorphite from 79 mine, Gila Co., Arizona, United States

Hemimorphite
            from 79 mine, Gila Co., Arizona, United States

Large blue botryoidal Hemimorphite with botryoids to 1.5cm across. 

Click thumbnail images for larger view.

Hemimorphite from Elkhorn mine, Jefferson Co., Montana, United States

Hemimorphite
            from Elkhorn mine, Jefferson Co., Montana, United States

Light bluish balls composed of bladed Hemimorphite. 

Click thumbnail images for larger view.

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