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Gemstones, Minerals & Fossils
Gemstones and Minerals
Identification (photos)
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<blockquote data-quote="RedDirtDigger" data-source="post: 315509" data-attributes="member: 2964"><p>Hi Wayne, Nice minerals. I worked in caves, know cave minerals well, and I have been around Chillagoe caves. All the specimens you posted (except number 4) i can confirm are definitely calcite formed in cavities in Limestone. Images 6&7 are calcite flowstone deposits formed on the floor/walls of caves or small cavities. The fine white crystals in the cavity (image 8) are calcite or more likely aragonite (the two minerals can pseudo morph from one form to the other) . The crystals probably formed as Helictites. (google for explanation)</p><p></p><p>Image 1 is definitely weathered calcite, Image 4 maybe calcite, it appears to have some weak conchoidal fracture lines, its possibly clear quartz....topaz on the outside chance. Hardness test would help ID it. I did see a lot of clear quartz flakes laying on the ground up there, a byproduct of 1000's of years of aboriginal toolmaking.</p><p>Cheers RDD</p></blockquote><p></p>
[QUOTE="RedDirtDigger, post: 315509, member: 2964"] Hi Wayne, Nice minerals. I worked in caves, know cave minerals well, and I have been around Chillagoe caves. All the specimens you posted (except number 4) i can confirm are definitely calcite formed in cavities in Limestone. Images 6&7 are calcite flowstone deposits formed on the floor/walls of caves or small cavities. The fine white crystals in the cavity (image 8) are calcite or more likely aragonite (the two minerals can pseudo morph from one form to the other) . The crystals probably formed as Helictites. (google for explanation) Image 1 is definitely weathered calcite, Image 4 maybe calcite, it appears to have some weak conchoidal fracture lines, its possibly clear quartz....topaz on the outside chance. Hardness test would help ID it. I did see a lot of clear quartz flakes laying on the ground up there, a byproduct of 1000's of years of aboriginal toolmaking. Cheers RDD [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Identification (photos)
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