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:There is also a community named Actinolite,_Ontario in Canada.

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

1 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.

2 Occurrence

Actinolite is commonly found in metamorphic rocks, such as contact aureole s surrounding cooled intrusive igneous rocks. It is also found in 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).

3 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

4 Related minerals

  1. Tremolite
  2. Jade
Minerals Silicate mineralsThe silicate minerals make up the the largest and most important class of rock-forming minerals. They are classified based on the structure of their silicate anion group. Subclasses: Nesosilicates Nesosilicates (or orthosilicates have SiO tetrahedra that

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Topics: Actinolite, Mineralogy, Occurrence, Details, Related Minerals...

ActinoliteThere is also a community named Actinolite,_Ontario in Canada. metadiabase intrudes light granitic gneiss Actinolite is an inosilicate mineral with the chemical formula Ca(MgFe)SiO(OH) Mineralogy Actinolite is an intermediate member in a series between trActinolite, OntarioActinolite is a community on the Skootamatta River in eastern Ontario. Actinolite is in the Municipality of Tweed, in Hastings County, on Highway 37 just south of Highway 7 and north of Tweed. It is well known for the Log Cabin Restaurant not for the cuis 
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