Phosgenite
Article Abstract:
Phosgenite stones are extremely rare because of their tetragonal crystal shape as well as their composition and occurrence. Phosgenite is a lead chloro-carbonate formed as secondary mineral. The major supply of large phosgenites are found at the Monte Poni mine in Sardinia, Italy.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Herderite
Article Abstract:
Herderite was found in Saxony as early as 1825 and was named after Baron von Herder. Collectors of anything facetable are the primary source of demand for this soft mineral. Most of the impressive specimens of this mineral were only found in the 20th century.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Silver
Article Abstract:
Silver's susceptibility to darkening limit its popularity among mineral collectors. Major sources of silver specimens are Konsberg, Norway, and Michigan's Upper Peninsula.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 2000
User Contributions:
Comment about this article or add new information about this topic: