Mineral description : Apophyllite

Apophyllite in prehnite from Bredsjönäs.
Apophyllite in prehnite from Bredsjönäs.
Apophyllite from Jalgaon, Maharastra, India.
Apophyllite from Aitik.

Mineral class Silicates : Phyllosilicates : Serpentinite - talc - Pyrophyllite group
Chemical formula KCa4F2(Si4O10)2*8H2O
Crystal system Tetragonal
Habitus As tetragonal crystals with cube or octaedric form. Also as foliated massive aggregates.
Cleavage Perfect basally, uneven fracture.
Hardness 4.5-5
Density 2.33-2.37
Color Colorless to white, sometimes with a red, green or yellowish hue.
Streak White
Luster Vitreous.
Description  
Occurance  
Associates  
Notes Gives violet flame color.
Soluble in hydrocloric acid.
Apophyllite is now divided into the separate minerals fluorapophylite, hydroxylapophylite and natroapophylite.
Locations A rare mineral in Sweden.
  • Nordmarks mines, Värmland. Pyramidic or foliated crystal groups, often in cracks in the iron ore.
  • Utö iron mine, in the arkipelago of Stockholm. As clear to slightly read large crystals.
  • Bredsjönäs, Skottvång, Södermanland. As thick druses or spherical aggregates in holes in the rock.
  • Långban, Värmland. As thin pink foliated masses in andradite scarn.
  • Sörgruvan, Hällestad, Östergötland. Foliated masses together with calcite crystals.
  • Dannemora mines. In druses together with babingtonite.
  • Alnön, Sundsvall. In small amounts.

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Last changed : 2000-06-05