Williamsite
| 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 |
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| 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) |
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| 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 |
Tags: Antigorite, Jenkinisite, Monoclinic, Picrolite, Picrosmine, Serpentine Group, Williamsite
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