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Harmotome (Photo) [abbr. Hrm ]

Year of discovery: 1801 (St Andreasberg, Germany), 1922 (Japan)

Locality list: 17 localities of harmotome

• Ba_2.5Al₅Si₁₁O₃₂,12H₂O
• (Ba_0.5,Ca_0.5,K,Na)₅Al₅Si₁₁O₃₂,12H₂O
• [Ba²⁺_2.5][Al₅Si₁₁O₃₂]^5-,12H₂O

• Class: Gismondine group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl
• Radioactive: Very weak

• Ba => Ca: Phillipsite-Ca (Series)

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

• Habit: Thick Tabular
• Twin: Cross shaped

• Cleavage: Distinct on {010} (1 plane), Indistinct on {001} (1 plane)
• Hardness: 4-5
• Density: 2.4

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=9.9, b=14.1, c=8.7, β=124.7