 |
|
|
Lazulite is an aesthetic blue mineral that forms in distinct crystals. Its name is very similar and often confused with Lazurite, which is an entirely different mineral species. However, the names of both these minerals are derived from the term "Lazaward", which means heaven in Arabic, alluding to their blue color. Lazulite forms a series with the rare mineral Scorzalite, which is the iron-rich equivalent of Lazulite. |
|
|
Chemical Formula |
(Mg,Fe)Al2(PO4)2(OH)2 |
|
Composition |
Basic phosphate of magnesium, iron, and aluminum
|
|
Color |
Dark indigo-blue to almost black, sky-blue, light blue, grayish-blue, and greenish-blue. May also have intermixed white or creamy streaks or splotches, or be multicolored blue and blue-green. Transparent Lazulite is pleochroic. |
|
Streak |
White |
|
Hardness |
5.5 - 6 |
|
Crystal System |
Monoclinic |
|
|
|
Crystal Forms
and Aggregates |
Crystal habits include steep bipyramidal or wedge-shaped crystals. Crystals are usually small and embedded in a matrix. Also tabular, in dense crystal masses, in aggregates of distorted or damaged crystals, grainy, and massive. Crystals are sometimes etched, and occasionally twinned.
|
|
Transparency |
Transparent to opaque |
|
Specific Gravity |
3.0 - 3.1 |
|
Luster |
Vitreous to dull |
|
Cleavage |
3,1 |
|
Fracture |
Uneven |
|
Tenacity |
Brittle |
|
In Group |
Phosphates; True Phosphates |
|
Striking Features |
Color and crystal habits |
| Environment |
In metamorphosed schists, hydrothermal replacement deposits, and igneous pegmatite dikes.
|
| Rock Type |
Igneous, Metamorphic |
|
Popularity (1-4)
|
2 |
|
Prevalence (1-3)
|
2 |
|
Demand (1-3) |
2 |
|
|
 |
|
|
|
|
Lazulite is a popular collectors mineral, and specimens from Graves Mountain (Georgia) and Rapid Creek (Yukon) are especially desirable. Specimens embedded in white Quartz, especially those from Austria, are sometimes sliced into slabs or polished for collectors. Lazulite is occasionally used a minor collectors gemstone.
|
One of the most famous localities for Lazulite is Graves Mountain, Lincoln Co., Georgia, which produced well-formed blue crystals embedded in a crumbly Quartz matrix. The locality of Rapid Creek (and nearby Crosscut Creek), in the Yukon Territory of Canada is also well-known for its outstanding transparent dark blue Lazulite crystals.
Austria is a classic producer of Lazulite, with the noteworthy localities of Fischbach, in Styria; and Werfen, in Salzburg. In Italy, Lazulite comes from the Vizze pass, Bolzano Province; and from Monte Folgorito, Pietrasanta, Lucca Province. Exceptionally large and gemmy distorted crystals came from Laila, Gilgit District, Pakistan.
Other U.S. occurrences are the Champion Mine, Mono Co., California; and North Groton, Grafton County, New Hampshire.
|
Lazurite - Different crystal habit, has a blue streak and lower specific gravity.
Scorzalite - Difficult to distinguish, though usually darker in color and higher specific gravity.
Sodalite - Difficult to distinguish, though usually has white veins and strong fluorescence.
|
|
|
|
|
|
|
|
Have a question about Lazulite? Visit our Q&A Community and ask the experts!
|
|
|
|
Let us know how we can update this page
(Click for more details)
|
|
We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.
|
 |
| |
|
|
|
|
|
|
|
