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Gemstones, Minerals & Fossils
Gemstones and Minerals
⭐ Gemstone & Mineral Show n Tell
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<blockquote data-quote="user 4386" data-source="post: 424186" data-attributes="member: 4386"><p>Jackstraws? Like long thin tubes or straws or hairs. The position simply depends on when the tourmaline started or stopped growing relative to the quartz. The silicon that forms quartz is unlikely to become depleted in the solution from which the quartz is growing, compared with things like sodium, iron, boron and aluminium which are required in addition to silicon to form tourmaline. It could conceivably also be a temperature effect due to cooling of the fluid (quartz will tend to crystallize down to low temperatures, probably tourmaline will not). Since the fluid will be water, the oxygen and hydrogen required for these minerals will always be present.</p><p></p><p>Nice specimens!</p></blockquote><p></p>
[QUOTE="user 4386, post: 424186, member: 4386"] Jackstraws? Like long thin tubes or straws or hairs. The position simply depends on when the tourmaline started or stopped growing relative to the quartz. The silicon that forms quartz is unlikely to become depleted in the solution from which the quartz is growing, compared with things like sodium, iron, boron and aluminium which are required in addition to silicon to form tourmaline. It could conceivably also be a temperature effect due to cooling of the fluid (quartz will tend to crystallize down to low temperatures, probably tourmaline will not). Since the fluid will be water, the oxygen and hydrogen required for these minerals will always be present. Nice specimens! [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
⭐ Gemstone & Mineral Show n Tell
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