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Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
Quetzalcoatlite is a rare tellurium oxysalt mineral with the formula Zn 6 Cu 3 (TeO 6) 2 (OH) 6 · Ag x Pb y Cl x+2y.It also contains large amounts of silver- and lead(II)chloride with the formula Ag x Pb y Cl x+2y (x+y≤2). [2]
Quartz is heated to 871 °C in vacuum, and golden wire is heated to even higher temperature, either by resistive heating with direct electrical current, or by magnetron. [1] Gold sublimation (phase transition) occurs, the resulting vapor depositing onto the crystal's surface.
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Its color is normally apple-green, but varies from turquoise-like cyan to deep green. The darker varieties of chrysoprase are also referred to as prase . (However, the term prase is also used to describe chlorite -included quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)
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Ametrine, also known as trystine or by its trade name as bolivianite, is a naturally occurring variety of quartz. It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is mined in Bolivia .