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Flint:
Tectosilicates (A variety of quartz often with some iron and aluminum) SiO2 AKA: Chalcedony |
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System: None; chalcedony is a microcrystalline variety of quartz. Appearance: Whitish, dull gray, smoky brown to black. Dull waxy to vitreous luster depending on granularity and the variety; streak white Physical Properties: Hardness: (7); Specific gravity: (2.6 - 2.64). Cleavage: None. Smooth conchoidal fracture; transparent when colorless, otherwise translucent to opaque as colors get darker; fracture, brittle to tough. Similar species: Very few minerals are confused with chalcedony/flint. Occurrence: Chalcedony is formed in several environments, generally near the surface of the earth where temperatures and pressures are relatively low. It commonly forms in the zone of alteration of lode and massive hydrothermal replacement deposits and as bodies of chert in chemical sedimentary rocks. Fine flint is found in chalk from the cliffs of Dover, England. Miscellaneous: Flint or chert are siliceous nodules frequently found in chalk and limestone. Most chalcedonies develop as a microcrystalline precipitate from aqueous solutions or as dehydration products of opal, in low-temperature environments. Conventional Wisdom: This mineral is an excellent choice for use in activities related to thought transference; one may transfer information, ideas and loving emotional messages to another and receive, in return. It can help to relieve shyness and to promote both intimate and personal experiences. It has been used as a talisman to bring intellectual, psychological, rational and physical strength during confrontations, arguments and disputes. Belongs to the Astrological Sign of Scorpio. |