Neptunite
San Benito County, California, USA
11.78 carats
© Rarestone.com
Neptunite forms translucent or opaque black or very dark red prismatic crystals with square cross-sections.
The crystals of Neptunite show piezoelectricity.
Neptunite 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 | ||||||||||||||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Neptunite | ||||||||||||||||||||||||||||||
| Mohs Hardness | 5 to 6, Gemstones of the world (2001) More from other references | |||||||||||||||||||||||||||||
| Specific Gravity | 3.19 to 3.23, Gemstones of the world (2001) More from other references | |||||||||||||||||||||||||||||
| Tenacity | Brittle, Handbook of Mineralogy (2001) | |||||||||||||||||||||||||||||
| Cleavage Quality | Perfect, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||||||
| Fracture | Conchoidal, Handbook of Mineralogy (2001) | |||||||||||||||||||||||||||||
| Refractive Index | Fatal error: Uncaught mysqli_sql_exception: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb3_general_ci,COERCIBLE) for operation '=' in /var/www/gemdat/gemshow_class.php:690 Stack trace: #0 /var/www/gemdat/gemshow_class.php(690): mysqli->query() #1 /var/www/gemdat/gemshow_class.php(505): gemshow_class->showdata() #2 /var/www/gemdat/gemshow_class.php(1465): gemshow_class->showblock() #3 /var/www/gemdat/gshow.php(151): gemshow_class->do_optical() #4 {main} thrown in /var/www/gemdat/gemshow_class.php on line 690 | |||||||||||||||||||||||||||||