karlite

{{Infobox mineral | name = Karlite | category = Borate mineral | boxwidth = | boxbgcolor = | image = Karlite.jpg | imagesize = | caption = | formula = Mg7(BO3)3(OH)4Cl | IMAsymbol = Ka | molweight = 412.74 g/mol | strunz = 6.AB.25 | system = Orthorhombic | class = Disphenoidal (222) H-M symbol: (222) | symmetry = P212121 | unit cell = | color = | habit = Acicular, fibrous, rosette like and fibrous aggregates | twinning = | cleavage = Perfect on {001} | fracture = | tenacity = | mohs = | luster = Silky | refractive = nα = 1.589 nβ = 1.632 nγ = 1.634 | opticalprop = Biaxial (-) | birefringence = δ = 0.045 | pleochroism = | streak = White | gravity = 2.80-2.85 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Semitransparent | other = | references = }}

Karlite (kar'-lite) is a silky white to light green orthorhombic borate mineral, not to be confused with tremolite-actinolite. It has a general formula of Mg7(BO3)3(OH)4Cl. Karlite is named in honor of Franz Karl (1918–1972), professor of mineralogy and petrography at Christian Albrechts University in Kiel, Germany, for his studies of the geology of the eastern Alps.