Clintonite is a calcium magnesium aluminium phyllosilicate mineral. It is a member of the margarite group of micas and the subgroup often referred to as the "brittle" micas. Clintonite has the chemical formula . Like other micas and chlorites, clintonite is monoclinic in crystal form and has a perfect basal cleavage parallel to the flat surface of the plates or scales. The Mohs hardness of clintonite is 6.5, and the specific gravity is 3.0 to 3.1. It occurs as variably colored, colorless, green, yellow, red, to reddish-brown masses and radial clusters.
{{infobox mineral | name = Clintonite | category = Phyllosilicate minerals | group = Mica group, brittle mica group | image = Clintonite-Spinel-235093.jpg | imagesize = | alt = | caption = Clintonite with spinel on orthoclase matrix from Amity, New York (size: 9.3 × 5.7 × 3.8 cm) | formula = | IMAsymbol=Cln | molweight = | strunz = | dana = | system = Monoclinic | class = Prismatic (2/m) or domatic (m) | symmetry = C2/m or (?) | unit cell = a = 5.204 Å, b = 9.026 Å, c = 9.812 Å; β = 100.35°; Z = 2 | color = Colorless, yellow, orange, red-brown, brown, green | colour = | habit = Tabular pseudohexagonal crystals; foliated or lamellar radiated; massive | twinning = Spiral polysynthetic twinning | cleavage = Perfect on {001} | fracture = | tenacity = Brittle | mohs = 3.5 on {001}, 6 at angle to {001} | luster = Vitreous, pearly, submetallic | streak = White, slightly yellow-gray | diaphaneity = Transparent to translucent | gravity = 3.0–3.1 | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.643 – 1.648 nβ = 1.655 – 1.662 nγ = 1.655 – 1.663 | birefringence = δ = 0.012 – 0.015 | pleochroism = X = colorless, pale orange, red-brown; Y = Z = pale brownish yellow, pale green | 2V = Measured: 2° to 40° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = }} Clintonite is a calcium magnesium aluminium phyllosilicate mineral. It is a member of the margarite group of micas and the subgroup often referred to as the "brittle" micas. Clintonite has the chemical formula . Like other micas and chlorites, clintonite is monoclinic in crystal form and has a perfect basal cleavage parallel to the flat surface of the plates or scales. The Mohs hardness of clintonite is 6.5, and the specific gravity is 3.0 to 3.1. It occurs as variably colored, colorless, green, yellow, red, to reddish-brown masses and radial clusters.
The brittle micas differ chemically from the micas in containing less silica and no alkalis, and from the chlorites in containing much less water; in many respects, they are intermediate between the micas and chlorites. Clintonite and its iron-rich variety xanthophyllite are sometimes considered the calcium analogues of the phlogopites.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).