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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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<blockquote data-quote="user 4386" data-source="post: 444021" data-attributes="member: 4386"><p>How hard is it? My guess is chlorite. The quartz vein filled a fracture in a large body of chlorite-rich rock, effectively "cementing" itself to the chlorite-rock on either side of the quartz vein. When the rock broke up to become a pebble or cobble, it broke loose along new fractures in the chlorite-rich rock (along what we call the cleavage in the mineral chlorite). Some chlorite remained attached to the margin of the quartz.</p><p></p><p>The key thing being it had become one homogeneous rock when the quartz-vein filled the fracture - and later breakage occurred most effectively within the chlorite (not within the quartz, nor right on its margin). </p><p></p><p>There is a more complex explanation possible, but that is essentially the process.</p></blockquote><p></p>
[QUOTE="user 4386, post: 444021, member: 4386"] How hard is it? My guess is chlorite. The quartz vein filled a fracture in a large body of chlorite-rich rock, effectively "cementing" itself to the chlorite-rock on either side of the quartz vein. When the rock broke up to become a pebble or cobble, it broke loose along new fractures in the chlorite-rich rock (along what we call the cleavage in the mineral chlorite). Some chlorite remained attached to the margin of the quartz. The key thing being it had become one homogeneous rock when the quartz-vein filled the fracture - and later breakage occurred most effectively within the chlorite (not within the quartz, nor right on its margin). There is a more complex explanation possible, but that is essentially the process. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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