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Cotunnite

Cotunnite is the natural mineral form of lead(II) chloride (PbCl2). Unlike the pure compound, which is white, cotunnite can be white, yellow, or green. The density of mineral samples spans range 5.3–5.8 g/cm3. The hardness on the Mohs scale is 1.5–2. The crystal structure is orthorhombic dipyramidal and the point group is 2/m 2/m 2/m. Each Pb has a…

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2V angle
Measured: 67°
Birefringence
δ = 0.061
Category
Halide mineral
Cleavage
Perfect on {010}
Color
Colorless to white, pale green, pale yellow
Crystal class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

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Cotunnite

Nodes29
Edges28
Triples23
Avg. degree1.93
Density0.068966
Components1

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Cotunnite

Top relations

2V angle · 1
Cotunnite → Measured: 67°
Birefringence · 1
Cotunnite → δ = 0.061
Category · 1
Cotunnite → Halide mineral
Cleavage · 1
Cotunnite → Perfect on {010}
Color · 1
Cotunnite → Colorless to white, pale green, pale yellow
Crystal class · 1
Cotunnite → Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Crystal habit · 1
Cotunnite → As elongated, flattened prismatic crystals; in aggregates of radiating sprays; granular, crustiform or pseudomorphs
Crystal system · 1
Cotunnite → Orthorhombic
Diaphaneity · 1
Cotunnite → Transparent to opaque
Formula · 1
Cotunnite → PbCl2

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Important terminology

occurs lead mineral vesuvius chile tolbachik italy first deposits alteration orthorhombic pbcl2 white yellow green hardness mohs scale crystal dipyramidal

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Cotunnite2V angleMeasured: 67°1.00infobox
CotunniteBirefringenceδ = 0.0611.00infobox
CotunniteCategoryHalide mineral1.00infobox
CotunniteCleavagePerfect on {010}1.00infobox
CotunniteColorColorless to white, pale green, pale yellow1.00infobox
CotunniteCrystal classDipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)1.00infobox
CotunniteCrystal habitAs elongated, flattened prismatic crystals; in aggregates of radiating sprays; granular, crustiform or pseudomorphs1.00infobox
CotunniteCrystal systemOrthorhombic1.00infobox
CotunniteDiaphaneityTransparent to opaque1.00infobox
CotunniteFormulaPbCl21.00infobox
CotunniteFractureSubconchoidal1.00infobox
CotunniteIMA symbolCot1.00infobox
CotunniteLusterAdamantine, silky to pearly1.00infobox
CotunniteMohs scale hardness2.51.00infobox
CotunniteOptical propertiesBiaxial (+)1.00infobox
CotunniteRefractive indexnα = 2.199 nβ = 2.217 nγ = 2.2601.00infobox
CotunniteSolubilitySlight in water1.00infobox
CotunniteSpace groupPnam1.00infobox
CotunniteSpecific gravity5.801.00infobox
CotunniteStrunz classification3.DC.851.00infobox
CotunniteTenacitySlightly sectile1.00infobox
CotunniteUnit cella = 7.6222(5) Å, b = 9.0448(7) Å, c = 4.5348(4) Å; Z = 41.00infobox
Cotunniteis anatural mineral form of lead0.90text

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