Deep blue clinoclase crystals on cornwallite from the Murdock mine. 0.5

from the USA is far less known than the English specimens and it's not common to find good pieces available for sale. The color of this piece is a

Clinoclase

Clinoclase mineral information and data

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Minerals Grow in Popularity for Admiring and Collecting - The New York Times

Marin Mineral Company - Selected Specimens

Well Arranged Molecules

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RareMinerals store for advanced collectors

Clinoclase mineral information and data

Full article: Montana Mineral Locality Index

PDF) Index A-Z Minerals (AA).pdf

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Well Arranged Molecules