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Pyrophyllite is a phyllosilicate mineral composed of aluminium silicate hydroxide: Al2Si4O10(OH)2. It occurs in two forms (habits): crystalline folia and compact masses; distinct crystals are not known.
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talc compact white phyllosilicate green occurs variety two folia varieties crystals luster hardness also minerals al2si4o10 oh pearly perfect cleavage
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Pyrophyllite | 2V angle | 53–62 | 1.00 | infobox |
| Pyrophyllite | Birefringence | δ =0.0450–0.0620 | 1.00 | infobox |
| Pyrophyllite | Category | Phyllosilicate minerals | 1.00 | infobox |
| Pyrophyllite | Cleavage | Perfect | 1.00 | infobox |
| Pyrophyllite | Color | Brown green, brownish yellow, greenish, gray green, gray white | 1.00 | infobox |
| Pyrophyllite | Crystal class | Prismatic (2/m) or pinacoidal (1) | 1.00 | infobox |
| Pyrophyllite | Crystal habit | Compact spherulitic aggregates of needlelike radiating crystals; as fine grained foliated laminae, granular, massive | 1.00 | infobox |
| Pyrophyllite | Crystal system | Monoclinic or triclinic | 1.00 | infobox |
| Pyrophyllite | Diaphaneity | Translucent to opaque | 1.00 | infobox |
| Pyrophyllite | Formula | Al2Si4O10(OH)2 | 1.00 | infobox |
| Pyrophyllite | Formula mass | 360.31 g/mol | 1.00 | infobox |
| Pyrophyllite | Fusibility | Infusible, exfoliates | 1.00 | infobox |
| Pyrophyllite | Group | Pyrophyllite-Talc group | 1.00 | infobox |
| Pyrophyllite | IMA symbol | Prl | 1.00 | infobox |
| Pyrophyllite | Luster | Pearly to dull | 1.00 | infobox |
| Pyrophyllite | Mohs scale hardness | 1.5–2 | 1.00 | infobox |
| Pyrophyllite | Optical properties | Biaxial (−) | 1.00 | infobox |
| Pyrophyllite | Refractive index | nα=1.534–1.556, nβ=1.586–1.589, nγ=1.596–1.601 | 1.00 | infobox |
| Pyrophyllite | Space group | C2/c or C1 | 1.00 | infobox |
| Pyrophyllite | Specific gravity | 2.65 – 2.9 | 1.00 | infobox |
| Pyrophyllite | Streak | white | 1.00 | infobox |
| Pyrophyllite | Tenacity | Flexible inelastic | 1.00 | infobox |
| Pyrophyllite | Unit cell | a = 5.16 Å, b = 8.966(3) Å, c = 9.347(6) Å; α = 91.18°, β = 100.46°, γ = 89.64°; Z = 2 | 1.00 | infobox |
| Pyrophyllite | is a | phyllosilicate mineral composed of aluminium silicate hydroxide | 0.90 | text |
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