by Mary Lucas | Mar 20, 2023 | Mine History
Continuation from Page 1 Barite, a complex parallel-growth crystal with multiple terminations, from a small isolated pocket; 7 by 5 cm. This was the largest gem-clear blue crystal collected. Barite with white (opal-coated) calcite, pocket #2; 6 cm across, main... by Mary Lucas | Mar 20, 2023 | Mine History
Collector’s Edge Minerals, Inc. recognizes and thanks Rocks & Minerals for permission to use portions or all of their original article from the “Rocks & Minerals”, Volume 65, Number 3, pp. 202-222. Contributing authors were Peter J. Modreski, U.S. Geological... by Mary Lucas | Mar 20, 2023 | Mine History
Amazonite: K(AlSi3O8)Amazonite is a green microcline feldspar, with a hardness on the Moh’s scale of 6-6-1/2. It forms in the triclinic crystal system. Studies suggest that the color is the result of small quantities of lead and water in the feldspar. (Hoffmeister... by Mary Lucas | Mar 20, 2023 | Mine History
In June, 1997, a beautiful pocket of blue-green microcline (v. amazonite) specimens was discovered in the classic Lake George, Colorado amazonite mining area. The specimens were discovered 2 meters beneath the surface, inside a collapsed pocket, eventually named the... by Mary Lucas | Mar 16, 2023 | Mine History
Collector’s Edge Minerals, Inc. recognizes and thanks the Mineralogical Record for permission to use portions or all of their original article from the “Mineralogical Record”, Volume 42, Number 6, pp. 521-544. Contributing authors were Bryan Lees and Steve Behling,...