4,020
edits
Difference between revisions of "Quartz"
no edit summary
Occultwiki (talk | contribs) |
Occultwiki (talk | contribs) |
||
| Line 2: | Line 2: | ||
'''Quartz''' is a hard, crystalline mineral composed of silica (silicon dioxide). There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia. | '''Quartz''' is a hard, crystalline mineral composed of silica (silicon dioxide). There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia. | ||
Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. | Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion. Quartz is the second most abundant mineral in [[Earth]]'s continental crust, behind feldspar. | ||
==Etymology== | ==Etymology== | ||