http://www.all-gemstones.com www.all-gemstones.com    Thu, 06 May 2010 12:29:47 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 http://www.all-gemstones.com/lapis-lazuli http://www.all-gemstones.com/lapis-lazuli#comments Wed, 07 Oct 2009 06:04:01 +0000 admin http://www.all-gemstones.com/?p=956

Refractive Index : 1.500 or 1.670

Optical Characteristic : SR, AGG

Specific Gravity : 2.75 (+0.25 – 0.25)

Formula : Varies depending on mineral content.

Crystal System : Rock

Variety/Species : Lapis Lazuli

Species/Group : Sodalite Group

Birefringence : None

Dispersion : N/A

Hardness : 5 to 6

Toughness : Fair

Ultrasonic : Risky

Steam : Never

UV Long : Inert to moderate

UV Short : Inert to moderate

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : Avoid heating

Acids : Attacked by acids and /or chemicals

Light : Stable

Polish Luster : Waxy to vitreous

Fracture : Granular to uneven

Fracture Luster : Dull

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color : Sulfur-connected color centers

Enhancements : Dyeing, impregnation

Cleavage : None

Color Range : Medium to dark,

Transparency :

Phenomena :

Separations : Lapis Lazuli from-

Identifying Characteristics and information

Spectral Data

Trade Names and Misnomers Afghan Lapis Chilean Lapis Gold Sapphire(M) Lapis Lazuli Lasurite Lazurite Persian Lapis Russian Lapis Sapphiros of Pliny Siberian Lapis

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