Hemimorphite

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By Species > Silicates > Sorosilicates

Hemimorphite

Mineral Species: Hemimorphite

Chemical Formula: Zn4Si2O7(OH)2 - H2O

Chemical Name: Hydrated Zinc Silicate Hydroxide

Mineral Class: Sorosilicate

Mineral Notes: Hemimorphite is one of the most common Sorosilicates. It is a fascinating mineral because its crystals are polar. What this means is that the crystal structure produces a different termination at each end, hence hemimorphic crystals from where it gets its name. One termination, the "bottom" is blunt being dominated by a pedion face while the "top" end is terminated by the point of a pyramid.

Description: Extremely well-formed, transparent crystals of Hemimorphite on a thin Matrix of limestone. The high luster makes this specimen very difficult to photograph. Nevertheless, the upright rosette of crystals at the centre of the specimen is absolutely superb, but must be magnified to see its astonishing form.

Location: Wapping Mine, Matlock Bath, Derbyshire, England.

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