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Hemimorphite

#PD39224

Hemimorphite

#PD39224
Availability
Sold
Size
10 x 6.5 x 4 cm - Cabinet 
Formula
Zn4Si2O7(OH)2·H2O (RRUFF)
Locality
79 mine, Gila Co., Arizona, United States

This is an older specimen to which the original tag designated it as coming from the Leonard mine in Butte. It was also tagged as Smithsonite on the original label. It is without doubt blue botyroidal Hemimorphite based on hardness, reaction to HCl, and is visually identical to older Hemimorphite from the 79 mine. In addtion, after showing this specimen to a number of dealers in Tucson, the general consensus was the 79 mine. There are a few photos out there which compare well. One is in Min. Record's recent  "Mineral Collections in Arizona" (2013) issue.  On page 197 is a large blue botryoidal Hemimorphite from the Les and Paula Presmyk collection. The clincher however is on page 25 of the same issue from William Besse's collection. On Besse's specimen note the thickness of the Smithsonite and it's concentric habit. Also look at the matrix, it is a black sooty matrix with a lot of small holes. The characteristics of Besse's specimen are consistent and compares very well with this specimen.   It's an excellent older specimen from the 79 mine and should rightfully belong to any serious Arizona collection.

Hemimorphite

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

Data courtesy of Webmineral.

Collection
Phillips Collection

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