Difference between revisions of "Lazulite"
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==Physical and Chemical Properties== | ==Physical and Chemical Properties== | ||
| − | * Monoclinic system with bipyramidal crystals or grains | + | * Monoclinic system with bipyramidal crystals or grains |
| − | * | + | * Cleavage = poor to good in one direction |
| − | * Fracture = uneven | + | * Fracture = uneven, splintery |
| − | * Luster = vitreous to dull | + | * Luster = vitreous to dull |
| − | * Streak = white | + | * Streak = white |
| + | * Fluorescence = inert | ||
| + | * Pleochroism = strong; dark violet blue and colorless to light blue | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 22: | Line 24: | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | 5. | + | | 5.5 - 6.0 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| Line 29: | Line 31: | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| 1.60; 1.63; 1.64 | | 1.60; 1.63; 1.64 | ||
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.031 - 0.037 | ||
|} | |} | ||
| Line 36: | Line 41: | ||
==Resources and Citations== | ==Resources and Citations== | ||
| + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | ||
* Mineralogy Database: [http://www.webmineral.com/data/Lazulite.shtml Lazulite] | * Mineralogy Database: [http://www.webmineral.com/data/Lazulite.shtml Lazulite] | ||
| − | |||
* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | * Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | ||
| − | |||
* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982 | * Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982 | ||
| − | |||
* ''Encyclopedia Britannica'', http://www.britannica.com Comment: "lazulite." Accessed 7 Apr. 2005 . | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "lazulite." Accessed 7 Apr. 2005 . | ||
| − | |||
* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | ||
| − | + | * Wikipedia: http://en.wikipedia.org/wiki/Lazulite (Accessed Sept. 7, 2005 and Dec 2022) | |
| − | * Wikipedia: http://en.wikipedia.org/wiki/Lazulite (Accessed Sept. 7, 2005) | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 15:07, 17 December 2022
Description
A minor blue-green color gemstone composed of iron aluminum phosphate. Although its name has caused some confusion, it has no connection with Lazurite, the main ingredient in Lapis lazuli. Lazulite is a translucent stone that has been found in Switzerland (Zermatt), Austria, Sweden, Malagasy Republic, Brazil (Minas Gerais), Canada (Yukon), and the U.S.(California, Georgia). It was used for inlays on an amulet from the Oxxus Treasure (Ogden 1982).
Synonyms and Related Terms
Lazulit (Deut.)
Physical and Chemical Properties
- Monoclinic system with bipyramidal crystals or grains
- Cleavage = poor to good in one direction
- Fracture = uneven, splintery
- Luster = vitreous to dull
- Streak = white
- Fluorescence = inert
- Pleochroism = strong; dark violet blue and colorless to light blue
| Composition | MgAl2(OH)2(PO4)2 |
|---|---|
| Mohs Hardness | 5.5 - 6.0 |
| Density | 3.0-3.4 g/ml |
| Refractive Index | 1.60; 1.63; 1.64 |
| Birefringence | 0.031 - 0.037 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Mineralogy Database: Lazulite
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- Encyclopedia Britannica, http://www.britannica.com Comment: "lazulite." Accessed 7 Apr. 2005 .
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: http://en.wikipedia.org/wiki/Lazulite (Accessed Sept. 7, 2005 and Dec 2022)