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Gemstones, Minerals & Fossils
Gemstones and Minerals
Granite rock with crystals embedded
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<blockquote data-quote="boobook" data-source="post: 297510" data-attributes="member: 1605"><p>I would go along with pegmatite also. </p><p>This is usually in a dyke form ie. a fairly narrow upthrust of composite of granites and other minerals through a fault or ground fissure.</p><p></p><p>In our locality these dykes run nnw/sse and often kilometres long.</p><p>The interesting thing about pegmatite is that it can be the host for beryl which in its best form would be gem emerald.</p><p></p><p>Some years ago we chased a pegmatite dyke over 2km. looking for the pocket of emerald we were sure to find.</p><p>The dyke was around 40cm. thick, we excavated down over 3m. in some places (weathered granite either side) for around 250 carats </p><p>of clear beryl crystals but unfortunately too light to be gem quality.</p><p></p><p>You just may be a lucky one, if you see any deep green colour go easy.</p><p>The crystals are a pencil shaped hexagon with flat/slightly bevelled terminations, often in a cluster.</p><p>mike</p></blockquote><p></p>
[QUOTE="boobook, post: 297510, member: 1605"] I would go along with pegmatite also. This is usually in a dyke form ie. a fairly narrow upthrust of composite of granites and other minerals through a fault or ground fissure. In our locality these dykes run nnw/sse and often kilometres long. The interesting thing about pegmatite is that it can be the host for beryl which in its best form would be gem emerald. Some years ago we chased a pegmatite dyke over 2km. looking for the pocket of emerald we were sure to find. The dyke was around 40cm. thick, we excavated down over 3m. in some places (weathered granite either side) for around 250 carats of clear beryl crystals but unfortunately too light to be gem quality. You just may be a lucky one, if you see any deep green colour go easy. The crystals are a pencil shaped hexagon with flat/slightly bevelled terminations, often in a cluster. mike [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Granite rock with crystals embedded
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