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Gemstones, Minerals & Fossils
Gemstones and Minerals
Unknown Green Crystal/rocks need identifying
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<blockquote data-quote="user 4386" data-source="post: 419036" data-attributes="member: 4386"><p>Hardness would tell - prehnite is almost as hard as quartz.</p><p></p><p>Prehnite forms balls but rarely shows good crystal faces like that, Which is why I thought it was calcite like this. But calcite is hardness 3.</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1529549745_calcite.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>compare with the unknown:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1529550209_calcite_possible.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I'm more familiar with a distinct green for prehnite, and with more radial crystals (when present) in the balls:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1529550599_prehnite.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="user 4386, post: 419036, member: 4386"] Hardness would tell - prehnite is almost as hard as quartz. Prehnite forms balls but rarely shows good crystal faces like that, Which is why I thought it was calcite like this. But calcite is hardness 3. [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1529549745_calcite.jpg[/img] compare with the unknown: [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1529550209_calcite_possible.jpg[/img] I'm more familiar with a distinct green for prehnite, and with more radial crystals (when present) in the balls: [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1529550599_prehnite.jpg[/img] [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Unknown Green Crystal/rocks need identifying
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