Actinolite [ ☐Ca2(Mg4.5-2.5FeII0.5-2.5)Si8O22(OH)2 ]

Image of Actinolite

Material properties

Formula ☐Ca2(Mg4.5-2.5FeII0.5-2.5)Si8O22(OH)2
Abbreviation Act
IMA Status Approved/redefined (IMA 2012 s.p.)
Crystal symmetry Monoclinic, Point group 2/m, Space group C2/m (#12)
Classifications Actinolite root name group, Ferro-actinolite-Tremolite (series), Minerals containing OH
Variant fibrous
Luminescence emitters Cr, Mn
Spectra Reflectance (4)
Search other databases webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Hydroxide, Mineral, Silicate

Composition

Element Wt%
H 0.24
Na 0.59
Mg 9.71
Ca 8.6
Ti 0.11
Mn 0.13
Fe 8.58
Al 1.39
Si 25.64
O 45.01
Total: 100

References for Actinolite

Reference
Lines Spectra Images
Bakhtin 1985 1 0 0
Bakhtin & Moroshkin 1986 1 0 0
Pejcic et al. 2022 (EP2022-5804) 0 2 0
Pejcic et al. 2021 (EP2021-1148) 0 2 0

Specimens of Actinolite

Name Owner Materials Phase purity Image Spectra Techniques
NR-ACT-02 Actinolite CSIRO Actinolite (89.3%), Clinochlore (var. Fe), Magnetite, Quartz, Tremolite 89.3 2 Reflectance
M1063 Scheelite CSIRO Actinolite (34.3%), Albite (var. Ca), Scheelite 34.3 0 —
MES177 Actinolite NVCL, AuScope Limited Actinolite (27.2%), Clinochlore (var. Fe), Quartz, Tremolite 27.2 2 Reflectance
MES082 Omphacite CSIRO Actinolite (8.0%), Albite, Calcite, Epidote, Ferro-glaucophane, Majorite, Omphacite, Quartz, Titanite 8.0 0 —
M0732 Magnetite CSIRO Actinolite (3.2%), Cummingtonite (var. Fe2+), Magnetite 3.2 0 —
MES181 Scheelite CSIRO Actinolite (1.9%), Scheelite 1.9 1 Reflectance
M1064 Scheelite CSIRO Actinolite (1.7%), Scheelite 1.7 2 Reflectance