Baveno twinning

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Orthoclase — General Category Silicate mineral Chemical formula KAlSi3O8 … Wikipedia
Celsian — is an uncommon feldspar mineral, barium aluminosilicate, BaAl2Si2O8. The mineral occurs in contact metamorphic rocks with significant barium content. Its crystal system is monoclinic, and it is white, yellow, or transparent in appearance. In pure … Wikipedia
Babingtonite — Infobox mineral name = Babingtonite category = boxwidth = boxbgcolor = imagesize = caption = Babingtonite from Baveno, Piemonte, Italy formula = Ca2(Fe,Mn)FeSi5O14(OH) molweight = color = Dark green to black habit = Prismatic crystals system =… … Wikipedia
Hyalophane — Infobox mineral name = Hyalophane category = Tectosilicate boxwidth = boxbgcolor = imagesize = caption = formula = (K,Ba) [Al(Si,Al)Si2O8] molweight = 302.06 gm color = colorless, yellow, white, red habit = crystalline fine occurs as well formed… … Wikipedia
Macle (cristallographie) — Pour les articles homonymes, voir Macle. Macle par pénétration de trois cristaux de pyrite Une macle est une association orientée de deux ou plusieurs cristaux identiques, di … Wikipédia en Français
microcline — /muy kreuh kluyn /, n. a mineral of the feldspar group, potassium aluminum silicate, KAlSi3O8, identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in making porcelain. [1840 50; MICRO + cline < Gk… … Universalium

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