Hardness orders minerals by how well they resist scratching. Wikipedia notes that "quartz is the mineral defining the value of 7 on the Mohs scale of hardness," the reference scale geologists use to compare one mineral against another. Browsing by hardness groups minerals that scratch, or resist scratching, in the same way.
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Formation OriginContain the tetrahedrally coordinated phosphate (PO4 3-) anion, sometimes with arsenate or vanadate substitution. 1 5
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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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