Archive for the Quartz Family Category

Smoky Quartz

Refractive Index : 1.553 – 1.544

Optical Characteristic : DR, U+, AGG

Specific Gravity : 2.651 (+0.04 – 0.01)

Formula : SiO2

Crystal System : Trigonal

Variety/Species : smoky

Species/Group : Quartz

Birefringence : 0.009

Dispersion : 0.013

Hardness : 7

Toughness : good

Ultrasonic : Usually safe

Steam : risky

UV Long : Inert

UV Short : Inert

Pleochroism : 2 colors

Strength : weak

Pleochroism Colors : Dark stones, weak: [...]

Tiger’s Eye

Refractive Index : 1.553-1.554

Optical Characteristic : DR, AGG

Specific Gravity : 2.651 +.06 -.01

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Tiger’s Eye

Species/Group : Quartz

Birefringence : 0.009

Dispersion : N/A

Hardness : 7

Toughness : Good

Ultrasonic : Uaually safe

Steam : Risky

UV Long : Inert

UV Short : Inert

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : Avoid aburt temperature change

Acids : [...]

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 : [...]

Quartz

Refractive Index : 1.553 – 1.544

Optical Characteristic : DR, Biaxial positive

Specific Gravity : 2.651 (+0.04 – 0.01)

Formula : SiO2

Crystal System : Trigonal

Variety/Species : All

Species/Group : quartz

Birefringence : 0.009

Dispersion : 0.013

Hardness : 7

Toughness : good

Ultrasonic : Usually safe

Steam : risky

UV Long : Inert

UV Short : Inert

Pleochroism : 2 colors

Strength : very weak

Pleochroism Colors : Varies. see [...]

Amethyst

Natural Amethyst Gemstone – Purple Quartz Crystal

Refractive Index : 1.553 – 1.544

Optical Characteristic : DR Uniaxial positive, AGG

Specific Gravity : 2.66 (+0.03 – 0.02)

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Amethyst

Species/Group : Quartz

Birefringence : 0.009

Dispersion : 0.013

Hardness : 7

Toughness : Good

Ultrasonic : Usually Safe

Steam : Risky

UV Long : Inert to Weak

UV Short : Inert to [...]

Zebra Tigers Eye

Refractive Index : 1.553 – 1.544

Optical Characteristic : DR, AGG

Specific Gravity : 2.651 + 0.06 – 0.01

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Zebra Tiger`s Eye

Species/Group : Quartz

Birefringence : 0.009

Dispersion : N/A

Hardness : 7

Toughness : Good

Ultrasonic : Usually safe

Steam : Risky

UV Long : Inert

UV Short : Inert

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : [...]

Star Quartz

Refractive Index : 1.553 – 1.544

Optical Characteristic : DR Uniaxial positive

Specific Gravity : 2.651 (+0.04 – 0.01)

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Quartz

Species/Group : Quartz

Birefringence : 0.009

Dispersion : 0.013

Hardness : 7

Toughness : good

Ultrasonic : Usually safe

Steam : risky

UV Long : Inert

UV Short : Inert

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : Avoid abrupt [...]

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 : Cryptocrystalline Quartz

Birefringence : .004

Dispersion : None

Hardness : 6.5 to 7

Toughness : Good

Ultrasonic : Usually Safe

Steam : Usually Safe

UV Long : Inert to moderate

UV Short : Inert to moderate

Pleochroism : None

Strength : N/A

Pleochroism [...]