A group of sheet silicate minerals that split into thin, flexible, glittering layers. It is the flecked shine in granite and gneiss, and the third of the three common minerals, with quartz and feldspar, that give granite its speckled texture. 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
Classification
Crystal System Classification UseIndustrial and Abrasive 2 Wikipedia 'Mica' states this use (or use-bearing statement); earth5 pass. Formation ClassSheet silicate (phyllosilicate) 3 Chemical FormulaX2Y4-6Z8O20(OH,F)4 (general mica-group formula) 1 Hardness (Mohs) Connections
Associated With
Granite's own lead description names mica as one of its main constituent minerals.
Source Granite (Wikipedia)
Mica named as one of the three dominant minerals of most pegmatites.
Source Pegmatite (Wikipedia)
Mica-rich schist (mica schist) is one of the most common schist varieties.
Source Schist (Wikipedia)
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)
Sources
1. Mica (Wikipedia)
Wikimedia FoundationClassification section
X2Y4-6Z8[O]20([OH],[F])4
Entity classification (SubLabel)
A group of sheet silicate minerals that split into thin, flexible, glittering layers. It is the flecked shine in granite and gneiss, and the third of the three common minerals, with quartz and feldspa
Mica (Wikipedia), body text
All crystallize in the monoclinic system, with a tendency towards pseudohexagonal crystals
View the Source 2. Wikidata: Mica
Wikidata Q114675Quote, Wikidata Q114675
P279 subclass chain verified to reach rock (Q8063) or mineral (Q7946) within a few hops; identified via Wikipedia pageprops (article title match), PlaybookNote 38526.
3. Mineral (Wikipedia)
Granite (Wikipedia)
Wikimedia FoundationAssociated With: Granite, Lead sectionQuote, Associated With: Granite, Lead section
is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, mica and plagioclase.
Pegmatite (Wikipedia)
Wikimedia FoundationAssociated With: Pegmatite, Lead sectionQuote, Associated With: Pegmatite, Lead section
Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite.
Schist (Wikipedia)
Wikimedia FoundationAssociated With: Schist, Body, protolith sectionQuote, Associated With: Schist, Body, protolith section
Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a mica schist).
Reader Challenges (0)
No disputes yet. Spotted an error or a better source? Open the first one.
Sign in to dispute this or suggest a correction.