Chalcedony is an aggregate of cryptocrystalline or microcrystalline silica, a mass of individual silica crystals too small to be seen without magnification, composed primarily of quartz with minor amounts of intergrown moganite. It has a waxy luster and may be semitransparent or translucent, and it takes a wide range of colors, most often white to gray, grayish-blue or brown. In this atlas it is the mineral species named for the many banded and colored silica gemstones, so the gemstones that record chalcedony as their species can be grouped and compared on one entity.
Facts
Chemical Formula Hardness (Mohs)Commonly cited range is 6 to 7 on the Mohs scale; 6.5, the midpoint, is used here. Classification
Classification Connections
Classified As
Entity-backed identity for the material classification this material already carries as an enum fact, pointing at the class subcategory of the same name. The enum fact itself stays on the entity unchanged.
In Discipline
In the Other Atlases
- Also in Divinity Atlas: Bloodstone, mineral species of there.
- Also in Divinity Atlas: Fire Agate, mineral species of there.
- Also in Divinity Atlas: Jasper, mineral species of there.
- Also in Divinity Atlas: Onyx, mineral species of there.
- Also in Divinity Atlas: Sardius, mineral species of there.
Sources
1. Chalcedony (Wikipedia)
Wikimedia FoundationChalcedony, lead paragraph
Chalcedony is an aggregate of cryptocrystalline or microcrystalline silica, or in simpler terms, a mass of individual silica crystals that are too small to be seen without magnification.
Chalcedony, article text
It is composed primarily of quartz, with minor amounts of intergrown moganite.
View the Source 2. Chalcedony (Wikipedia)
Article body
Many semi-precious gemstones are in fact forms of chalcedony.
Article body, gemstone
Many semi-precious gemstones are in fact forms of chalcedony.
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