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2. 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 ...

3. Geode - Wikipedia

   en.wikipedia.org/wiki/Geode

   A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.

4. File:Agate- & quartz-lined geode 5 (32375570960).jpg - Wikipedia

   en.wikipedia.org/wiki/File:Agate-_&_quartz-lined...

   The most common geode-lining mineral is quartz. This geode is bordered by brownish, yellowish, and grayish agate. "Agate" is a rockhound/collector term for irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz. The light gray, glassy & pale purplish material near the center is macrocrytalline quartz.

5. 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. Adherents of the practice claim that these have healing powers, but there is no scientific basis for this claim.

6. Prasiolite - Wikipedia

   en.wikipedia.org/wiki/Prasiolite

   The word prasiolite literally means "scallion green-colored stone" and is derived from Greek πράσον prason meaning "leek" and λίθος lithos meaning "stone". The mineral was given its name due to its green-colored appearance. Natural prasiolite is a very light, translucent green. Darker green quartz is generally the result of ...

7. List of physical properties of glass - Wikipedia

   en.wikipedia.org/wiki/List_of_physical...

   Unless stated otherwise, the properties of fused silica (quartz glass) and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors (in general more than 10 independent sources for quartz glass and T g of germanium oxide glass). The list is not exhaustive.