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Magnesio-hastingsite [abbr. Mhs ]

Year of discovery: 1928 (Mont Royal, Canada), 1966 (Japan)

Locality list: 7 localities of magnesio-hastingsite

• NaCa₂Mg₄FeAl₂Si₆O₂₂(OH)₂
• [Na⁺][Ca²⁺₂][Mg²⁺₄][Fe³⁺][(OH)₂|(AlSi₃O₁₁)₂]^16-

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

• Na => K: Potassic-magnesio-hastingsite

• Mg => Fe: Hastingsite (Series)

• Fe => Al: Pargasite (Series)
• Fe => Cr: Chromio-pargasite

• OH => F: Magnesio-fluoro-hastingsite

• NaMg => []Fe: Ferri-tschermakite

• CaMg => NaFe: Ferri-taramite

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

• NaSi => CaAl: Ferri-cannilloite

• CaAl => NaSi: Ferri-katophorite

• FeAl => MgSi: Edenite

• MgSi => FeAl: Ferri-sadanagaite

• Mg(OH)₂ => TiO₂: Ferri-kaerusutite

• Cleavage: Perfect (2 planes, 120 degree)

• Color: Green, Greenish brown
• Streak: Pale greenish gray, Pale greenish brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Cleavage: Good on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.0, c=5.3, β=105.3