Rocks, Gems, and Minerals by Garret Romaine
Author:Garret Romaine
Language: eng
Format: epub
Publisher: Falcon Guides
Published: 2020-03-21T00:00:00+00:00
Chrysocolla
Striking blue chrysocolla resembles turquoise.
PHOTO COURTESY OF THE RICE NORTHWEST MUSEUM OF ROCKS AND MINERALS
(Cu,Al)2H2Si2O5(OH)4·nH2O
Family: Silicate
Mohs: 2½–3½
Specific gravity: 1.9–2.4
Key test(s): Soft
Likely locale(s): Copper-producing regions
Chrysocolla is a pleasing blue or green material, usually banded, and softer than turquoise. It produces a streak that is slightly blue-green in color, which is helpful. Its luster is vitreous to dull, and it forms in botryoidal masses or coatings rather than as crystals. Chrysocolla oxidizes from copper deposits. Its softness precludes it from being an important lapidary material, but it will take a polish.
There are numerous chrysocolla deposits throughout the copper-mining regions of the Rockies, such as the Bay Horse and Seven Devils districts of Idaho. In Wyoming, search the copper-mining areas in Albany and Carbon Counties. Montana is a major copper-producing state, thus, the area around Butte is noteworthy among hundreds of locales. Colorado also boasts numerous chrysocolla deposits.
Download
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.
Sapiens: A Brief History of Humankind by Yuval Noah Harari(13003)
The Tidewater Tales by John Barth(12016)
Do No Harm Stories of Life, Death and Brain Surgery by Henry Marsh(6322)
Mastermind: How to Think Like Sherlock Holmes by Maria Konnikova(6197)
The Thirst by Nesbo Jo(5758)
Why We Sleep: Unlocking the Power of Sleep and Dreams by Matthew Walker(5615)
Sapiens by Yuval Noah Harari(4510)
Life 3.0: Being Human in the Age of Artificial Intelligence by Tegmark Max(4474)
The Longevity Diet by Valter Longo(4425)
The Rules Do Not Apply by Ariel Levy(3886)
The Immortal Life of Henrietta Lacks by Rebecca Skloot(3808)
The Body: A Guide for Occupants by Bill Bryson(3762)
Why We Sleep by Matthew Walker(3751)
Animal Frequency by Melissa Alvarez(3741)
Yoga Anatomy by Kaminoff Leslie(3685)
Barron's AP Biology by Goldberg M.S. Deborah T(3617)
The Hacking of the American Mind by Robert H. Lustig(3566)
All Creatures Great and Small by James Herriot(3493)
Yoga Anatomy by Leslie Kaminoff & Amy Matthews(3383)