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Quartz Psm Calcite

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BSM581602

Quartz Psm Calcite

ex Philadelphia Academy of Natural Sciences #2070
With Antique Label

Description Tabs

Description
Locality: 
Rio del Monte Mine, Harrisburg Valley, Harquahala, La Paz County, Arizona, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
9.8 × 12.8 × 4 cm
Description

A highly unusual specimen which tells an interesting historical story (see below). This is a quartz pseudomorph afte calcite with clusters of bladed crystals on the front display face while on the back are epimorphs of both thin blades and partial rhomboherdrons. Now to the history.

Rio Del Monte is in Arizona but the  label states Mexico. Prior to 1821 Arizona was part of the territory of Alta California in New Spain. It became part of the state of Sonora following Mexico's independence in 1821. In 1848, after the American-Mexican war Arizona became part of New Mexico, a US Territory. It became a US state in 1912. Dr Burrough donated his natural history collections to the Philadelphia Academy of Natural Sciences prior to or around 1831. It can be concluded therefore that this specimen was probably collected between 1822 and 1831.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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