The most stable form of calcium carbonate and the mineral that limestone and marble are built from. It defines hardness 3 on the Mohs scale and effervesces visibly in weak acid, a standard field test for identifying it. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Formation Class Chemical FormulaCaCO3, calcium carbonate 2 Hardness (Mohs)Calcite is the reference mineral that defines the value of 3 on the Mohs scale itself. Classification
Crystal SystemTrigonal (Rhombohedral) 1 Classification UseSculpture and Ornamental 3 Wikipedia 'Calcite' states this use (or use-bearing statement); earth5 pass. Connections
Associated With
Calcite named as one of the most common marine evaporite minerals; cited via evaporite's own registered source since Calcite carries only the generic mineral-wikipedia stub as its own source.
Source Evaporite (Wikipedia)
Skarn typically forms from a carbonate (limestone or marble) protolith, and calcite persists in many skarns.
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 enum value this material already carries, resolved to an earth concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The crystal-system fact itself stays on the material unchanged.
In Discipline
Source Mineral (Wikipedia)
In the Other Atlases
- Also in Divinity Atlas: Calcite, mineral species of there.
- Also in Divinity Atlas: Green Calcite, mineral species of there.
Sources
1. Calcite (Wikipedia)
Calcite (Wikipedia), infoboxQuote, Calcite (Wikipedia), infobox
Crystal system: Trigonal
2. Mineral (Wikipedia)
Wikimedia FoundationEntity classification (SubLabel)Quote, Entity classification (SubLabel)
The most stable form of calcium carbonate and the mineral that limestone and marble are built from. It defines hardness 3 on the Mohs scale and effervesces visibly in weak acid, a standard field test
3. Wikidata: Calcite
Wikidata Q171917Quote, Wikidata Q171917
P279 subclass chain verified to reach rock (Q8063) or mineral (Q7946) within a few hops; identified via Wikipedia pageprops (article title match), PlaybookNote 38526.
Evaporite (Wikipedia)
Wikimedia FoundationAssociated With: Evaporite, Marine evaporite minerals sectionQuote, Associated With: Evaporite, Marine evaporite minerals section
The most common marine evaporites are calcite, gypsum and anhydrite, halite, sylvite, carnallite, langbeinite, polyhalite, and kainite.
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