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2. Rutilated quartz - Wikipedia

   en.wikipedia.org/wiki/Rutilated_quartz

   Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black. The inclusions may be distributed randomly or in bundles, which sometimes are arranged ...

3. Rutile - Wikipedia

   en.wikipedia.org/wiki/Rutile

   Rutile is a common accessory mineral in high-temperature and high-pressure metamorphic rocks and in igneous rocks. Thermodynamically, rutile is the most stable polymorph of TiO 2 at all temperatures, exhibiting lower total free energy than metastable phases of anatase or brookite. [7] Consequently, the transformation of the metastable TiO 2 ...

4. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...

5. Vasily Konovalenko - Wikipedia

   en.wikipedia.org/wiki/Vasily_Konovalenko

   Materials: Beloretsk quartz, rutilated quartz, obsidian, tiger eye, agate, lapis lazuli, ruby, petrified wood, jasper, gold, silver, labradorite, serdolic agate and nundoorite. Height 24 cm. [1]: 102 • In the Sultry Afternoon I: An obese man gorges on watermelon while enjoying a cool soak on a hot afternoon.

6. Category:Quartz varieties - Wikipedia

   en.wikipedia.org/wiki/Category:Quartz_varieties

   Varieties of the mineral Quartz. Subcategories. ... Rutilated quartz; S. Shocked quartz This page was last edited on 28 November 2020, at 10:13 ...

7. Acicular (crystal habit) - Wikipedia

   en.wikipedia.org/wiki/Acicular_(crystal_habit)

   Acicular, in mineralogy, refers to a crystal habit composed of slender, needle-like crystals. Crystals with this habit tend to be fragile. Complete, undamaged acicular specimens are uncommon. Needle-shaped acicular millerite crystals on white quartz. The term "acicular" derives from the Late Latin "acicula" meaning "little needle". [1]