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Garnet

Silicate Minerals

Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. The members share similar physical and crystallographic properties but have a wide range of chemical compositions that define distinct species, which fall into two primary solid solution series, the pyralspite series (pyrope, almandine, spessartine) and the ugrandite series (uvarovite, grossular, andradite). The word comes from the 14th-century Middle English gernet, meaning dark red. In this atlas this entity is the garnet group as a whole, for gemstones recorded only as garnet without a named species; grossular and spessartine have their own entities.

Facts
Classification
Crystal System
Cubic (Isometric) 1
Classification
Silicate Mineral 1
Use
Gemstone 1
Kind
Mineral 1
Hardness (Mohs)
7 1
The Wikipedia article gives a range of 6.5 to 7.5 on the Mohs scale for the group; 7.0, the midpoint, is used here.
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.

Crystallizes In System

Entity-backed identity for the crystal system this mineral already carries as an enum fact, phase 3 bucket conversion (docs\design_entity_backed_browse_buckets_20260928.md, w-bucketconv-divmore2-0929). The original fact stays on the entry unchanged.

In Discipline

In the Other Atlases
Sources
1. Garnet (Wikipedia)
Wikimedia Foundation
  • Garnet, lead paragraph
    are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives
  • Garnet, article text
    These species fall into two primary solid solution series: the pyralspite series (pyrope, almandine, spessartine)
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