What does micaceous mean?
Micaceous is an adjective describing a mineral or rock that contains mica, or that has a structure resembling it. Mica is a group of minerals that forms thin, flat, often translucent layers, so micaceous materials may glitter when light catches their surfaces and can sometimes split along distinct planes. The word is especially common in geology, mineralogy, and descriptions of rocks such as schist and clay. In general writing, 'micaceous' is more exact than simply saying that something sparkles, because it identifies a particular layered or flaky texture or mineral content. It is also useful when discussing the physical properties of stone, including the way it separates into sheets and reflects light. The term is normally used with minerals and rocks rather than for ordinary manufactured objects, though it can more generally refer to anything containing or resembling mica.
adjectiveContaining mica or having a structure or composition resembling mica. The term is used especially of minerals and rocks that contain mica or can be split into thin, flaky layers.
- Containing mica.
- Resembling mica, especially in its ability to split into thin, flexible layers.
"The cliff exposes a distinctly micaceous schist that sparkles in the sunlight."
"The geologist identified the sample as a micaceous rock with a fine-grained crystalline structure."
"Light reflects from the micaceous surface of the stone, making the exposed face sparkle."
A micaceous rock can look ordinary until light catches its tiny plates of mica, revealing a glittering surface.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does micaceous come from?
The word 'micaceous' was formed in English from 'mica' plus the suffix '-aceous,' a combining form meaning 'having the nature or quality of.' 'Mica' comes through Latin from the Latin word mica, although the deeper origin of that name is uncertain. The resulting adjective has long been used in mineralogical and geological description.
How micaceous is actually used
This is primarily a technical geological and mineralogical term. It is usually applied to materials containing mica or displaying mica-like platy structure, and is more precise than the general term 'sparkly.'