Crystals
Anthophyllite
Anthophyllite • amphibole group — idealized Mg₇Si₈O₂₂(OH)₂ (Fe → ferroanthophyllite) Crystal system: Orthorhombic • Series: anthophyllite–gedrite Mohs: ~5.5–6 • SG: ~2.9–3.2 • Luster: vitreous–pearly Cleavage: two directions ~56° & 124°...
Anthophyllite
Anthophyllite • amphibole group — idealized Mg₇Si₈O₂₂(OH)₂ (Fe → ferroanthophyllite) Crystal system: Orthorhombic • Series: anthophyllite–gedrite Mohs: ~5.5–6 • SG: ~2.9–3.2 • Luster: vitreous–pearly Cleavage: two directions ~56° & 124°...
Ametrine
Quartz Family (Bicolor) Amethyst + Citrine Mohs 7 Ametrine 💜✨ — Where Amethyst Meets Citrine in One Crystal Half twilight, half sunrise. Ametrine is the “two moods, one gem” we...
Ametrine
Quartz Family (Bicolor) Amethyst + Citrine Mohs 7 Ametrine 💜✨ — Where Amethyst Meets Citrine in One Crystal Half twilight, half sunrise. Ametrine is the “two moods, one gem” we...
Zoisite
Zoisite • orthorhombic sorosilicate; polymorph of clinozoisite Formula (ideal): Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) • Group relation: epidote–clinozoisite–zoisite Mohs: ~6–6.5 • SG: ~3.1–3.4 • Luster: vitreous (pearly on cleavage) • Cleavage: perfect {010} Pleochroism:...
Zoisite
Zoisite • orthorhombic sorosilicate; polymorph of clinozoisite Formula (ideal): Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) • Group relation: epidote–clinozoisite–zoisite Mohs: ~6–6.5 • SG: ~3.1–3.4 • Luster: vitreous (pearly on cleavage) • Cleavage: perfect {010} Pleochroism:...
Zeolite
Zeolite • mineral group of hydrated aluminosilicates with open frameworks General formula: Mₓ/n[AlₓSiᵧO₂(ₓ₊ᵧ)]·wH₂O (M = Na, K, Ca, etc.; water in channels) Crystal systems: various (monoclinic/orthorhombic/trigonal/isometric) Mohs: ~3.5–5.5 • SG:...
Zeolite
Zeolite • mineral group of hydrated aluminosilicates with open frameworks General formula: Mₓ/n[AlₓSiᵧO₂(ₓ₊ᵧ)]·wH₂O (M = Na, K, Ca, etc.; water in channels) Crystal systems: various (monoclinic/orthorhombic/trigonal/isometric) Mohs: ~3.5–5.5 • SG:...
Sugilite
Sugilite • cyclosilicate (milarite‑group) — idealized KNa₂(Fe,Mn,Al)₂Li₃Si₁₂O₃₀ Crystal system: Hexagonal • Habit: massive, granular; rare microcrystals Mohs: ~6–6.5 • SG: ~2.74–2.80 • Luster: vitreous to waxy Colors: lavender → royal...
Sugilite
Sugilite • cyclosilicate (milarite‑group) — idealized KNa₂(Fe,Mn,Al)₂Li₃Si₁₂O₃₀ Crystal system: Hexagonal • Habit: massive, granular; rare microcrystals Mohs: ~6–6.5 • SG: ~2.74–2.80 • Luster: vitreous to waxy Colors: lavender → royal...
Scolecite
Scolecite • zeolite group — CaAl₂Si₃O₁₀·3H₂O Crystal system: Monoclinic • Habit: acicular needles, radiating sprays, sheaf‑like bundles, fibrous masses Mohs: ~5–5.5 • SG: ~2.2–2.3 • Luster: vitreous–silky Cleavage: perfect in...
Scolecite
Scolecite • zeolite group — CaAl₂Si₃O₁₀·3H₂O Crystal system: Monoclinic • Habit: acicular needles, radiating sprays, sheaf‑like bundles, fibrous masses Mohs: ~5–5.5 • SG: ~2.2–2.3 • Luster: vitreous–silky Cleavage: perfect in...