Legrandite
Mexico
0.45 carats
© Rarestone.com
Legrandite forms in tight clusters and sometimes transparent bright yellow, orange, colourless elongated prismatic crystals. These crystals are large enough to be faceted.
Legrandite 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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| General Information | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Formula |
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| Physical Properties of Legrandite | ||||||||||||||
| Mohs Hardness | 4.5 to 5, Gemstones of the world (2001) More from other references | |||||||||||||
| Specific Gravity | 3.98 to 4.04, Gemstones of the world (2001) More from other references | |||||||||||||
| Tenacity | Brittle, Handbook of mineralogy (2001) | |||||||||||||
| Cleavage Quality | Poor, Gemstones (2009) More from other references | |||||||||||||
| Fracture | Uneven, Gemstones (2009) | |||||||||||||
| Optical Properties of Legrandite | ||||||||||||||
| Refractive Index | 1.702 to 1.740, Gems, Sixth Edition (2006) RI for the alpha, beta and gamma rays is 1.702, 1.709, 1.740More from other references | |||||||||||||
| Optical Character | Biaxial/+, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Birefringence | 0.060, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Pleochroism | Yellow to colourless, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Dispersion | Strong, Gemstones (2009) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Yellow, colourless, Gemstones of the world (2001) More from other references | |||||||||||||
| Transparency | Transparent, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Lustre | Vitreous, Gemstones of the world (2001) More from other references | |||||||||||||
| Crystallography of Legrandite | ||||||||||||||
| Crystal System | Monoclinic, Gemstones of the world (2001) More from other references | |||||||||||||
| Habit | Elongated prismatic crystals, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | An uncommon secondary mineral in the oxidized zone of Zn–As-bearing deposits; rare in granite pegmatite, Handbook of mineralogy (2001) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Legrandite information at mindat.org | |||||||||||||
| Significant Gem Localities | ||||||||||||||
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