Hemimorphite

Hemimorphite
Zinc Silicate Hydroxide Hydrate, Zn4Si2O7-(OH)2.H2O

Hemimorphite is a secondary mineral which occurs in the oxidized portions of zinc deposits. It is commonly associated with smithsonite, cerussite, anglesite, galena and sphalerite.

Hemimorphite is rather variable in appearance. The specimen above is from the 79 Mine in Arizona where it is associated with rosalite, chrysocolla, and cerussite and occurs as curious blue, and sometimes white, eggshell-like balls on matrix.


Rocks from Bob's Collection

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bkeller@rockhounds.com 8/16/95