Archive for the Amphibole Group Category

Tremolite

Refractive Index : 1.643-1.560

Optical Characteristic : DR, B-

Specific Gravity : 3.20-2.90

Formula : Ca2Mg5Si8O22(OH)2 +Fe

Crystal System : Monoclinic

Variety/Species : Tremolite

Species/Group : Amphibole group

Birefringence : 0.017 – 0.028

Dispersion : N/A

Hardness : 5 to 6

Toughness : Good to poor

Ultrasonic : Never

Steam : Never

UV Long : Inert

UV Short : Inert

Pleochroism : 2 colors

Strength : N/A

Pleochroism Colors :
Green gems: [...]