Actinolite
IMA number:IMA2012 s.p.Database ID:784
Изображения
2 изображений
IMA chemistry
☐Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2
Valence chemistry
Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2
Классификация
Crystal systems
Моноклинная
Space groups
C2, m
IMA symbol
Act
IMA status
Approved, Redefined
Structural group
Amphibole
Status notes
Originally named actynolite: Kirwan R (1794) 16th species: actynolite. in Elements of Mineralogy, 2nd Edition, Volume 1 Elmsly (London) 167-170
Country
Germany / Austria
Published
1794
Oldest age Ma
4 000
Paragenetic modes
AbioticPrimarySecondaryStage 3a: Earth's earliest Hadean crustPM7 - Ultramafic igneous rocksPM8 - Mafic igneous rocksStage 3b: Earth's earliest hydrospherePM16 - Low-T aqueous alterationStage 4a: Earth's earliest continental crustPM31 - Contact metamorphismStage 4b: Highly evolved igneous rocksPM37 - Layered igneous formationsStage 5: Initiation of plate tectonicsPM39 - High-P metamorphismPM40 - Regional metamorphism