Actinolite

From Academic Kids

There is also a community named Actinolite in Ontario, Canada.

Missing image
ActinoliteUSGS.jpg
Well-cleaved, dark, fine-grained chlorite-actinolite metadiabase intrudes light granitic gneiss

Actinolite is an inosilicate mineral with the chemical formula
Ca2(MgFe)5Si8O22(OH)2

Contents

Mineralogy

Actinolite is an intermediate member in a series between tremolite (Mg-rich) and ferro-actinolite (Fe-rich). As seen from the chemical formula above, Mg and Fe ions can be freely exchanged in the crystal structure.

Occurrence

Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks. It is also occurs as a product of metamorphism of magnesium-rich limestones.

Some forms of asbestos are formed from fibrous actinolite, the fibres being so small that they can enter the lungs and damage the alveoli. Another form of actinolite, known as nephrite, is one of the two common constituents of jade (the other being jadeite).

Details

Crystallographic systemMonoclinic
ColoursPale to dark green. White or grey when in asbestos form
LustreVitreous to dull glassy
Hardness5.5-6
Refractive index 1.61
Cleavage2
PleochroismYellow to dark green to transparent to opaque

Related minerals

  1. Tremolite
  2. Jade

Reference

ja:緑閃石 pl:Aktynolit sk:Aktinolit

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