Kristalopedia
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Scalenohedron • zeolite group — CaAl₂Si₃O₁₀·3H₂O Crystal system: monoclinic • Habit: needle crystals, radial clusters, "foot"-shaped bundles, fibrous masses Mohs: ~5–5.5 • SG: ~2.2–2.3 • Luster: vitreous–silky Cleavage: perfect in...
School date
Scalenohedron • zeolite group — CaAl₂Si₃O₁₀·3H₂O Crystal system: monoclinic • Habit: needle crystals, radial clusters, "foot"-shaped bundles, fibrous masses Mohs: ~5–5.5 • SG: ~2.2–2.3 • Luster: vitreous–silky Cleavage: perfect in...
White Agates
White agate • banded chalcedony variety (microcrystalline SiO₂) Color and appearance: white to “milk glass” bands with semi-transparent windows; sometimes creamy/gray accents Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy–glassy...
White Agates
White agate • banded chalcedony variety (microcrystalline SiO₂) Color and appearance: white to “milk glass” bands with semi-transparent windows; sometimes creamy/gray accents Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy–glassy...
Outdoor feldspar
Feldspar group • tectosilicates Two series: alkaline (K‑Na) and plagioclase (Na‑Ca) Moso ~6–6.5 • two cleavages ~90° Feldspar 🔶 — the silent superstar of the Earth's crust (and the source...
Outdoor feldspar
Feldspar group • tectosilicates Two series: alkaline (K‑Na) and plagioclase (Na‑Ca) Moso ~6–6.5 • two cleavages ~90° Feldspar 🔶 — the silent superstar of the Earth's crust (and the source...
Rutile quartz
Rutile quartz • Quartz with rutile (TiO₂) needles Also called: Venus’s hair • Amur’s arrows Host: quartz (Mohs ~7, SG ~2.65) • Guest: rutile needles (metallic golden to reddish-brown tones)...
Rutile quartz
Rutile quartz • Quartz with rutile (TiO₂) needles Also called: Venus’s hair • Amur’s arrows Host: quartz (Mohs ~7, SG ~2.65) • Guest: rutile needles (metallic golden to reddish-brown tones)...
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 →...
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 →...
Oniksas
Onyx (gemstone sense) • straight-banded chalcedony — microcrystalline SiO₂ Classic palette: black/white bands; sardonyx = brown/red (sard) + white Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy vitreous • Cleavage:...
Oniksas
Onyx (gemstone sense) • straight-banded chalcedony — microcrystalline SiO₂ Classic palette: black/white bands; sardonyx = brown/red (sard) + white Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy vitreous • Cleavage:...