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2. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing ...

3. Metal-coated crystal - Wikipedia

   en.wikipedia.org/wiki/Metal-coated_crystal

   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.

4. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

5. Dumortierite - Wikipedia

   en.wikipedia.org/wiki/Dumortierite

   Dumortierite is a fibrous variably colored aluminium boro-silicate mineral, Al 7 BO 3 (SiO 4) 3 O 3.Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals.

6. Quartz fiber - Wikipedia

   en.wikipedia.org/wiki/Quartz_fiber

   A quartz fiber dosimeter, a device using a quartz fiber.. Since quartz fiber is expensive, it has limited applications. [2] It is used mainly for producing composite materials (due to having higher stability compared to glass fiber) and in electrical applications where thermal resistance and dielectric properties are important. [9]

7. Phantom quartz - Wikipedia

   en.wikipedia.org/wiki/Phantom_quartz

   Phantom quartz is a variety of quartz consisting of visible layers of overlapping crystal growths. The outline of the inner crystals can be seen due to some variation in composition or mineral inclusion making the boundary between growths visible. [1] The interior crystal layers are known as phantoms. Phantoms can be found in many varieties of ...

8. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   Thermoluminescence from heating chlorophane specimens on a hotplate. Triboluminescence from rubbing together two quartz crystals.. First, it will be useful to introduce some mineralogical terminology for gemstones that can glow when exposed to light, friction, or heat.

9. Heliotrope (mineral) - Wikipedia

   en.wikipedia.org/wiki/Heliotrope_(mineral)

   A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).