Use groups earth materials by what people actually do with them. Wikipedia notes that "since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings," a use that has nothing to do with the mineral's scientific classification. This dimension connects a material to its place in human hands rather than only in the ground.
Facts
Comparison
Formation OriginContain the tetrahedrally coordinated phosphate (PO4 3-) anion, sometimes with arsenate or vanadate substitution. 1 Gemstone
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Classifies
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.
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.
Sources
1. Wikipedia: Phosphate minerals
WikipediaPhosphate minerals, lead sectionQuote, Phosphate minerals, lead section
Phosphate minerals are minerals that contain the tetrahedrally coordinated phosphate (PO3-4) anion, sometimes with arsenate (AsO3-4) and vanadate (VO3-4) substitutions, along with chloride (Cl-), fluoride (F-), and hydroxide (OH-) anions, that also fit into the crystal structure.
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