Crystals
Seraphinite
Seraphinite • trade name for feather‑chatoyant Clinochlore (chlorite group, phyllosilicate) Crystal system: Monoclinic • Cleavage: perfect basal (micaceous) Hardness: ~2–2.5 • SG: ~2.6–2.8 • Luster: silky to pearly Signature: shimmering...
Seraphinite
Seraphinite • trade name for feather‑chatoyant Clinochlore (chlorite group, phyllosilicate) Crystal system: Monoclinic • Cleavage: perfect basal (micaceous) Hardness: ~2–2.5 • SG: ~2.6–2.8 • Luster: silky to pearly Signature: shimmering...
Turquoise
Turquoise • hydrated copper–aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O Crystal system: Triclinic • Habit: microcrystalline masses, veinlets, nodules Mohs: ~5–6 • SG: ~2.6–2.9 • Luster: waxy to sub‑vitreous Color: robin’s‑egg blue →...
Turquoise
Turquoise • hydrated copper–aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O Crystal system: Triclinic • Habit: microcrystalline masses, veinlets, nodules Mohs: ~5–6 • SG: ~2.6–2.9 • Luster: waxy to sub‑vitreous Color: robin’s‑egg blue →...
Tourmaline
Tourmaline • complex borosilicate cyclosilicate — general: X Y₃ Z₆ (T₆O₁₈)(BO₃)₃ V₃ W Crystal system: Trigonal • Habit: long striated prisms (triangular cross‑section), radial & massive aggregates Mohs: ~7–7.5 •...
Tourmaline
Tourmaline • complex borosilicate cyclosilicate — general: X Y₃ Z₆ (T₆O₁₈)(BO₃)₃ V₃ W Crystal system: Trigonal • Habit: long striated prisms (triangular cross‑section), radial & massive aggregates Mohs: ~7–7.5 •...
Flint
Flint • dark variety of chert — micro/cryptocrystalline SiO₂ Setting: nodules & layers in chalk/limestone (diagenetic silicification) Mohs: ~7 • SG: ~2.58–2.64 • Luster: dull→waxy (vitreous on fresh fractures) Fracture:...
Flint
Flint • dark variety of chert — micro/cryptocrystalline SiO₂ Setting: nodules & layers in chalk/limestone (diagenetic silicification) Mohs: ~7 • SG: ~2.58–2.64 • Luster: dull→waxy (vitreous on fresh fractures) Fracture:...
Kunzite
Kunzite • pink–violet variety of spodumene (LiAlSi₂O₆) Crystal system: Monoclinic • Pleochroic (strong) • Cleavage: perfect in two Hardness: 6.5–7 • SG: ~3.18 • Luster: vitreous Character: delicate color from...
Kunzite
Kunzite • pink–violet variety of spodumene (LiAlSi₂O₆) Crystal system: Monoclinic • Pleochroic (strong) • Cleavage: perfect in two Hardness: 6.5–7 • SG: ~3.18 • Luster: vitreous Character: delicate color from...
Iron tiger eye
Iron Tiger Eye • a.k.a. Tiger Iron — metamorphic banded rock Composition: tiger’s eye quartz (SiO₂) + hematite/magnetite (Fe‑oxides) + red jasper (microcrystalline SiO₂) Textures: chatoyant silky bands + metallic...
Iron tiger eye
Iron Tiger Eye • a.k.a. Tiger Iron — metamorphic banded rock Composition: tiger’s eye quartz (SiO₂) + hematite/magnetite (Fe‑oxides) + red jasper (microcrystalline SiO₂) Textures: chatoyant silky bands + metallic...