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Hastingsite (Photo) [abbr. Hst ]

Year of discovery: 1896 (Dungannon Township, Canada), 1927 (Japan)

Locality list: 42 localities of hastingsite

• NaCa₂Fe₅Al₂Si₆O₂₂(OH)₂
• [Na⁺][Ca²⁺₂][Fe²⁺₄][Fe³⁺][(OH)₂|(AlSi₃O₁₁)₂]

• Class: Ca amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Ino-Aluminosilicate (Double chain) - Hydroxide

• Fe²⁺ => Mg: Magnesio-hastingsite

• Fe³⁺ => Al: Ferro-pargasite

• Al => Si: Ferro-edenite

• Si => Al: Ferro-ferri-sadanagaite

• NaFe²⁺ => []Fe³⁺: Ferro-ferri-tschermakite

• NaAl => []Si: Ferro-ferri-hornblende

• CaFe => NaFe: Ferro-ferri-taramite

• Fe²⁺(OH)₂ => TiO₂: Ferro-ferri-kaerusutite

• Color: Black, Dark green, Greenish brown
• Streak: Greenish gray
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.0, c=5.3, β=105.1

Synonym: Ferrohastingsite