Archive for the Cryptocrystaline Quartz Category

Turritella Agate

Refractive Index : 1.54 – 1.53

Optical Characteristic : AGG

Specific Gravity : 2.60 + 0.30 – 0.05

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Chalcedony

Species/Group : Cryptocrystaline Quartz

Birefringence : 0.004

Dispersion : None

Hardness : 6.5 to 7

Toughness : Good

Ultrasonic : Uaually safe

Steam : Usually safe

UV Long : Inert to moderate

UV Short : Inert to moderate

Pleochroism : None

Strength : [...]