About Pyrophyllite
Hydrated aluminum silicate, similar to talc but with aluminum instead of magnesium, often white or pale with a greasy feel. It's a calming stone, promoting emotional balance and tranquility. (Used for carvings, 'Agalmatolite').
Primary Hues
White, Grey, Yellowish, Greenish, Brownish, often with a greasy or pearly luster, foliated or radiating fibrous masses
Geological & Scientific Details
Pyrophyllite is classified as a silicate minerals mineral which typically crystallizes in the monoclinic[2] or triclinic[3] system. Its chemical formula is Al2Si4O10(OH)2. Common crystal habits include compact spherulitic aggregates of needlelike radiating crystals; as fine grained foliated laminae, granular, massive.
Key Geological Properties:
- Mineral Category: Silicate minerals
- Chemical Formula: Al2Si4O10(OH)2
- IMA Symbol: Prl[1]
- Crystal System: Monoclinic[2] or triclinic[3]
- Formula Mass (g/mol): 360.31 g/mol
- Predominant Geological Color: Brown green, brownish yellow, greenish, gray green, gray white
- Crystal Habit: Compact spherulitic aggregates of needlelike radiating crystals; as fine grained foliated laminae, granular, massive
- Cleavage: [001] Perfect
- Luster: Pearly to dull
- Streak: white
- Diaphaneity: Translucent to opaque
Associated Minerals
- Talc
- Kaolinite
- Sericite
- Muscovite
- Andalusite
- Kyanite
- Quartz