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Tremolite (Photo) [abbr. Tr ]

Year of discovery: 1789 (Campolungo, Switzerland), 1898 (Japan)

Locality list: 376 locality of tremolite

• Ca₂Mg₅Si₈O₂₂(OH)₂
• Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
• [][Ca²⁺₂][Mg²⁺₅][(OH)₂|(Si₄O₁₁)₂]^14-
• Mg/(Mg+Fe2+)=0.9-1.0

• Class: Ca amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Inosilicate (Double chain) - Hydroxide
• Insoluble in: HCl, HNO₃, H₂SO₄
• Fluorescence: UV excitation (Yellow-Orange)
• One of minerals called Asbestos.

• Mg/(Mg+Fe2+)=0.5-0.9: Actinolite (Series)
• Mg => Fe: Ferro-actinolite (Series)

• Ca => Na₂: Richterite

• Ca => Mn: Clino-suenoite
• Ca => Mg: Anthophyllite, Cummingtonite, Proto-anthophyllite

• CaMg => NaAl: Winchite
• CaMg => NaFe: Ferri-winchite

• []Si => NaAl: Edenite

• MgSi => Al₂: Magnesio-hornblende (Series)
• MgSi => FeAl: Magnesio-ferri-hornblende

• Mg₂Si₂ => Al₄: Tschermakite
• Mg₂Si₂ => Fe₂Al: Ferri-tschermakite

• Color: Colorless, White, Brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular, Prismatic
• Aggregate: Columnar

• Cleavage: Perfect on {110} (2 planes, 120 degree), Distinct on {010} (1 plane)
• Hardness: 5-6
• Density: 3.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=18.0, c=5.3, β=105.0

Etymology: Tremola valley in Switzland

Synonym: Trémolite