Crocoite
Dundas mineral field, Zeehan district, West Coast municipality, Tasmania, Australia
4.09 carats
© Rarestone.com
Crocoite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Crocoite Gemstones by Size
This table shows distribution of Crocoite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:4.09 cts
Heaviest:4.20 cts
Average:4.14 cts
Total photos:2
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| General Information | |||||||||
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| Chemical Formula |
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| Physical Properties of Crocoite | |||||||||
| Mohs Hardness | 2.5 to 3, Gemmological Tables (2004) More from other references | ||||||||
| Specific Gravity | 5.90 to 6.10, Gemmological Tables (2004) More from other references | ||||||||
| Cleavage Quality | Distinct, Gemstones (2009) | ||||||||
| Fracture | Conchoidal, Gemstones (2009) | ||||||||
| Optical Properties of Crocoite | |||||||||
| Refractive Index | 2.31 to 2.66, Gemmological Tables (2004) More from other references | ||||||||
| Optical Character | Biaxial/+, Gemmological Tables (2004) More from other references | ||||||||
| Birefringence | 0.35, Gemmological Tables (2004) More from other references | ||||||||
| Pleochroism | Distinctly trichroic, Gemstones (2009) | ||||||||
| Dispersion | Nil, Gemstones (2009) | ||||||||
| Colour | |||||||||
| Colour (General) | Yellowish-red, orange, Gemmological Tables (2004) More from other references | ||||||||
| Causes of Colour | Yellow to red, O2-→Cr6+ charge transfer, Pragmatic Spectroscopy For Gemologists (2011) | ||||||||
| Transparency | Transparent,Translucent, Gemmological Tables (2004) More from other references | ||||||||
| Lustre | Adamantine,Vitreous, Gemstones (2009) | ||||||||
| Fluorescence & other light emissions | |||||||||
| Fluorescence (General) | A reddish to dark-brown fluorescence may sometimes be seen, Gems, Sixth Edition (2006) | ||||||||
| Crystallography of Crocoite | |||||||||
| Crystal System | Monoclinic, Gemmological Tables (2004) More from other references | ||||||||
| Habit | Prismatic, Gems, Sixth Edition (2006) More from other references | ||||||||
| Further Information | |||||||||
| Mineral information: | Crocoite information at mindat.org | ||||||||
| Significant Gem Localities | |||||||||
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