Picture Jasper
- picture jasper, landscape jasper, chalcedony (kal-SED-uh-nee) is microcrystalline or cryptocrystalline quartz; hexagonal (trigonal) crystal system; chemical composition SiO2
- natural material no any treatment
- opaque
- brown color with appearance landscape scene
- landscape agate, picture agate, fortification agate, etc – chalcedony with colored patterns resembling a landscape, etc. We always use “Jasper” to call this material in business industry.
Identification
- Refractive Index: 1.535-1.539; 1.53 or 1.54 spot reading
- Birefringence: usually not detectable, but may show .004
- Pleochroism: none
- Specific Gravity: 2.60 (+.10,-.05)
- Polish Luster: greasy to vitreous
- Fracture: conchoidal; sometimes granular
- Luster: dull to waxy
- Cleavage: none
- Hardness: 6 ½ to 7
- Toughness: good
Sources: South Africa
Stone information is reference from
Gem Reference Guide, Published by GIA. ISBN 0-87311-019-6
Gemstones of the World, Published by Sterling Publishing Co., Inc NY, ISBN 1-4027-4016-6
Encyclopedia of GEMSTONE, Published by ISHINSHA CO., LTD. ISBN 978-986-251-831-1
