almarudite

{{Infobox mineral | name = Almarudite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = {{chem2|K([ ],Na)2(Mn^{2+},Fe^{2+},Mg)2(Be,Al)3[Si12O30]}} | IMAsymbol =Alr | molweight = | strunz = | dana = | system = | class = | symmetry = | unit cell = | color = Yellow to orange | colour = | habit = | twinning = | cleavage = None Observed | fracture = Irregular/Uneven | tenacity = | toughness = | mohs = 6 | luster = Vitreous | streak = Pale orange | diaphaneity = Transparent, Translucent | gravity = 2.714 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} Almarudite (IMA symbol: Alr) is an extremely rare alkaline manganese beryllium silicate mineral of the cyclosilicates (ring silicates) class, with the chemical formula {{chem2|K([ ],Na)2(Mn^{2+},Fe^{2+},Mg)2(Be,Al)3[Si12O30]}}, from the volcanic environment of the Eifel Mountains in Germany.

==References==