Collection: Anthophyllite

Anthophyllite is a mineral of the amphibole group , more precisely a magnesium and iron silicate belonging to the isomorphic anthophyllite-gedrite series . It is best known for its industrial use in certain types of asbestos , although it is rarer than other types such as chrysotile.


🧪 Chemical formula:

  • (Mg,Fe)₇Si₈O₂₂(OH)₂

The composition varies depending on the proportion of magnesium and iron.


📌 Physical characteristics:

  • Color : grayish, brownish, greenish

  • Luster : Vitreous to silky

  • Crystal system : orthorhombic

  • Hardness (Mohs) : 5.5 to 6

  • Density : 2.85 to 3.2

  • Cleavage : perfect to good

  • Appearance : prismatic crystals or fibrous aggregates


🌍 Origin and deposits:

Anthophyllite forms in magnesium-rich metamorphic rocks , such as ultramafic rocks or schists . It is often found in:

  • Scandinavia (Norway, Finland)

  • United States (North Carolina)

  • Sri Lanka

  • South Africa


🧭 Not to be confused with:

  • Gedrite : an amphibole richer in aluminum, very similar chemically

  • Actinolite or tremolite : other amphiboles which can also occur in fibrous form

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