Montebrasite 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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Montebrasite Gemstones by Size
This table shows distribution of Montebrasite 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:2.56 cts
Heaviest:8.71 cts
Average:5.38 cts
Total photos:4
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| General Information | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Formula |
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| Physical Properties of Montebrasite | |||||||||||
| Mohs Hardness | 6, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Specific Gravity | 2.98 to 3.10, Blue Chart Gem Identification (2010) | ||||||||||
| Tenacity | Brittle, Handbook of Mineralogy (2001) | ||||||||||
| Cleavage Quality | Perfect, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Fracture | Uneven,Sub-Conchoidal, Handbook of Mineralogy (2001) | ||||||||||
| Optical Properties of Montebrasite | |||||||||||
| Refractive Index | 1.578 to 1.646, Blue Chart Gem Identification (2010) | ||||||||||
| Optical Character | Biaxial/+, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Birefringence | 0.020 to 0.030, Blue Chart Gem Identification (2010) | ||||||||||
| Colour | |||||||||||
| Colour (General) | Commonly light yellow, Blue Chart Gem Identification (2010) More from other references | ||||||||||
| Transparency | Transparent,Translucent, Handbook of Mineralogy (2001) | ||||||||||
| Lustre | Vitreous,Pearly, Handbook of Mineralogy (2001) | ||||||||||
| Fluorescence & other light emissions | |||||||||||
| Fluorescence (Long-Wave UV) | Inert to weak green, Blue Chart Gem Identification (2010) | ||||||||||
| Phosphorescence | May phosphoresce light blue to LW and SW, Blue Chart Gem Identification (2010) | ||||||||||
| Crystallography of Montebrasite | |||||||||||
| Crystal System | Triclinic, Blue Chart Gem Identification (2010) | ||||||||||
| Habit | Crystals typically equant, may be short to long prismatic, to 10 cm; as coarse cleavable or blocky to rounded nodular masses., Handbook of Mineralogy (2001) | ||||||||||
| Geological Environment | |||||||||||
| Where found: | A late primary and secondary mineral in zoned granite pegmatites; may be an ore of lithium., Handbook of Mineralogy (2001) | ||||||||||
| Further Information | |||||||||||
| Mineral information: | Montebrasite information at mindat.org | ||||||||||
| Significant Gem Localities | |||||||||||
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