monoclinic Inosilicates
Actinolite (Prismatic)
Ca2(Mg,Fe)5Si8O22(OH)2
Quick Facts
Hardness
5.0
Specific Gravity
3.0
Refractive Index
1.613
Optical Character
Biaxial -
Crystal Structure
#! Species: Actinolite
#! System: Monoclinic (2/m)
#! Habit: Elongated prismatic
monoclinic[2/m]:{110}@1.0 + {010}@0.8 + {100}@0.4 + {001}@0.9 | elongate(c:3.0)
monoclinic
2/m
{110} {010} {100} {001}
Physical Properties
Crystal Systemmonoclinic
Hardness (Mohs)5.0
Specific Gravity3.0
CleavagePerfect {110} at 56°
FractureSplintery
LustreVitreous to silky
Optical Properties
Refractive Index1.613
Birefringence0.022
Optical CharacterBiaxial -
Pleochroismmoderate: Yellow-green / Deep green
Colours
GreenDark greenGrey-green
Localities
TanzaniaMadagascarCanadaNew ZealandTaiwan
Common Inclusions
Fibrous structureMagnetite inclusions
Known Treatments
None commonly applied
Crystal Forms
prismpinacoid
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground #! Species: Actinolite
#! System: Monoclinic (2/m)
#! Habit: Elongated prismatic
monoclinic[2/m]:{110}@1.0 + {010}@0.8 + {100}@0.4 + {001}@0.9 | elongate(c:3.0)
Related Minerals
Other minerals in the monoclinic system
