What does nacrite mean?
Nacrite is a relatively uncommon white clay mineral and a member of the kaolinite group. Chemically, it is hydrated aluminum silicate, with the formula Al2Si2O5(OH)4. Its most recognizable feature is a pearly or nacreous luster, especially on cleavage surfaces, together with a fine-grained and platy crystal structure. Mineralogists distinguish nacrite from closely related kaolinite-group minerals through crystallographic analysis rather than appearance alone. The name ultimately derives from the same family of words as nacre, the iridescent shell material familiar from mother-of-pearl. Although not widely encountered outside specialized geology, nacrite is of interest because it illustrates how mineral names often preserve older associations with familiar natural materials and their characteristic qualities.
nounNacrite is a white, pearly clay mineral composed chiefly of hydrated aluminum silicate. It is a member of the kaolinite group and is distinguished from related minerals by its crystal structure and characteristic pearly luster.
- A white, pearly clay mineral with the chemical formula Al2Si2O5(OH)4, belonging to the kaolinite group.
"The collector examined a specimen of nacrite under magnification to study its pearly cleavage surfaces."
"Thin layers of nacrite occur in the mineral assemblage associated with the deposit."
"The polished nacrite displays a soft, pearlescent sheen."
Normally used only when referring to multiple mineral specimens or occurrences; the substance itself is generally treated as uncountable.
"The museum houses nacrites from several classical mineral localities."
Nacrite takes its name from the same root as nacre, the shimmering material that lines mollusk shells.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of nacrite
Nacrite entered English through French, where nacrite was applied to the mineral in reference to its pearly appearance. The name is related to French nacre, meaning mother-of-pearl, which in turn comes through medieval and earlier forms connected with the Latin word for mother-of-pearl. The shared imagery reflects the mineral's nacreous sheen rather than any direct material relationship.
How nacrite is actually used
The term is chiefly used in geology and mineralogy. Like other mineral names, it is normally treated as an uncountable name for the substance, but the plural can be used for individual specimens.
Easily confused with nacrite
Nacrite is a mineral, whereas nacre is the naturally occurring pearly material found in the shells of mollusks.
Nacrite is a white clay mineral with a pearly luster, while nephrite is a tough variety of amphibole used traditionally as jade.