List of Gemstones | Rare Minerals | Gem stones | Gems » Serpentine Group 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 Verd-antique http://www.all-gemstones.com/verd-antique http://www.all-gemstones.com/verd-antique#comments Thu, 13 Aug 2009 05:55:32 +0000 admin http://www.all-gemstones.com/?p=1465   Refractive Index : 1.570 – 1.560 (+ 0.004 – 0.070) Optical Characteristic : DR, AGG Specific Gravity : 2.57 (+ 0.23 – 0.13) Formula : (Mg,Fe,Ni)3Si2O5(OH)4 Crystal System : Monoclinic Variety/Species : Verd-antique Species/Group : Serpentine Group Birefringence : None Dispersion : None Hardness : 2.5 to 6 Toughness : Poor Ultrasonic : Never Steam : Risky UV Long : Inert to weak UV Short : Inert Pleochroism : None Strength : N/A
Pleochroism Colors : None Heat : Fusible Acids : Attacked by acids and/or chemicals Light : Stable Polish Luster : Waxy to vitreous Fracture : Granular to uneven Fracture Luster : Waxy to dull Clarity Type : N/A Tones : N/A Saturations : N/A Cause of Color : Iron, chromium, nickel Enhancements : Dyeing, wax impregnation Cleavage : Perfect in 1 direction Color Range : Green, dark green, dark mottled or veined green Transparency : Semitranslucent to opaque Phenomena : Chatoyancy (very weak)
Separations : Verd-antique from-
Chalcedony : Fracture, spectrum, hardness, RI(possibly), SG(possibly)Nephrite : RI, SG, hardness(possibly)Variscite : appearance, color filter, spectrum, hardness(possibly)
Green

Turquoise : appearance, RI, spectrum, hardness(possibly)

Jadeite : RI, SG, spectrum Identifying Characteristics and information
Black chromite octahedra inclusions; white veins; moss-like inclusions; polish often poor,showing scratches.Mostly used for counterops or building facings or other ornamental products Spectral Data
Not diagnostic Trade Names and Misnomers
Verd-antique   ]]> http://www.all-gemstones.com/verd-antique/feed 0 Williamsite http://www.all-gemstones.com/williamsite http://www.all-gemstones.com/williamsite#comments Fri, 07 Aug 2009 07:39:27 +0000 admin http://www.all-gemstones.com/?p=1503   Refractive Index : 1.570 – 1.560 (0.004 – 0.070) Optical Characteristic : DR, AGG Specific Gravity : 2.57 (+ 0.23 -0.13) Formula : (Mg,Fe,Ni)3Si2O5(OH)4 Crystal System : Monoclinic Variety/Species : Antigorite Species/Group : Serpentine Group Birefringence : None Dispersion : None Hardness : 2.5 to 6 Toughness : Poor Ultrasonic : Never Steam : Risky UV Long : Inert to weak UV Short : Inert Pleochroism : None Strength : N/A

Pleochroism Colors : None Heat : Fusible Acids : Attacked by acids and/or chemicals Light : Stable Polish Luster : Waxy to vitreous Fracture : Granular to uneven Fracture Luster : Waxy to dull Clarity Type : N/A Tones : N/A Saturations : N/A Cause of Color : Iron, chromium, nickel Enhancements : Dyeing, wax impregnation Cleavage : Perfect in 1 direction Color Range : Green, intense green Transparency : Semitransparent to translucent Phenomena : Chatoyancy (very weak)
Separations : Williamsite from-
Chalcedony : Fracture, spectrum, hardness, RI(possibly), SG(possibly)Nephrite : RI, SG, hardness(possibly)

Variscite : appearance, color filter, spectrum, RI(possibly)

Jadeite : RI, SG, spectrum Identifying Characteristics and information
Black chromite octahedra inclusions; white veins; moss-like inclusions; polish often poor, showing scratches Spectral Data
Not diagnostic Trade Names and Misnomers
Jenkinisite
Picrolite
Picrosmine
Williamsite   ]]> http://www.all-gemstones.com/williamsite/feed 0