Mica
A broad group of sheet silicates that commonly split into thin elastic or flexible sheets.
Language and route: European vernacular ← Latin (proposed). Commonly linked to Latin micāre, ‘to glitter, flash’, but the precise transmission of the mineral noun is not fixed merely by this appealing resemblance.
Literal gloss: glitter / glisten
The name and its history
Traditional material name; no unique first inventor · Mineral noun attested by early 18th century
- What does the word literally mean?
- The transmitted name is Commonly linked to Latin micāre, ‘to glitter, flash’, but the precise transmission of the mineral noun is not fixed merely by this appealing resemblance. The short gloss ‘glitter / glisten’ is a guide to the naming allusion, not by itself a modern mineralogical definition.
- What did the original author mean?
- Mica had many trade and workshop labels before early modern mineralogists used the group name; the appearance and usefulness of sheets preceded chemical classification.
- Why was the name needed?
- The group was recognised by its ability to split into thin shiny sheets, including as a translucent substitute for window glass.
- What evidence supported the original concept?
- Sheet cleavage, shine, transparency and practical craft uses supplied the initial evidence; chemical and structural differentiation came later.
- How has geology changed the concept?
- The modern mica group contains many species and subgroups; the word does not guarantee transparent colourless muscovite.
Further historical context
Mica had many trade and workshop labels before early modern mineralogists used the group name; the appearance and usefulness of sheets preceded chemical classification.
The group was recognised by its ability to split into thin shiny sheets, including as a translucent substitute for window glass.
Sheet cleavage, shine, transparency and practical craft uses supplied the initial evidence; chemical and structural differentiation came later.
The modern mica group contains many species and subgroups; the word does not guarantee transparent colourless muscovite.
Related names
Muscovite · Biotite · Phlogopite · Feldspar
Sources
- Mindat, Mica Group — Historic appearance-based name and modern sheet-silicate group
- Mineralogical Society of America, IMA Nomenclature Reports — Formal commission publications on mica, pyroxene and amphibole classification
- IMA–CNMNC, List of Mineral Names (updated September 2026) — Contemporary mineral-species standing; consult live master list