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Lazulite
Phosphate mineral
Phosphate mineral
| Field | Value |
|---|---|
| name | Lazulite |
| image | Lazulite-tmix07-168a.jpg |
| caption | Lazulite specimen found near Rapid Creek, Yukon, Canada |
| category | Phosphate mineral |
| formula | |
| IMAsymbol | Lzl |
| strunz | 8.BB.40 |
| system | Monoclinic |
| class | Prismatic (2/m) |
| (same H–M symbol) | |
| symmetry | *P2*1/c |
| unit cell | a = 7.144(1), b = 7.278(1) |
| c = 7.228(1) [Å]; β = 120.5(1)°; Z = 2 | |
| color | Azure, sky blue, bluish white, yellow-green, blue-green, rarely green |
| habit | Tabular, acute to stubby bipyramidal crystals; granular, massive |
| twinning | Common by several twin laws |
| cleavage | Poor to good on {110}, indistinct on {101} |
| fracture | Uneven, splintery |
| tenacity | Brittle |
| mohs | 5.5–6.0 |
| luster | Vitreous |
| streak | White |
| diaphaneity | Transparent to translucent to nearly opaque |
| gravity | 3.122–3.240 |
| opticalprop | Biaxial (−) |
| refractive | nα = 1.604–1.626 |
| nβ = 1.626–1.654 | |
| nγ = 1.637–1.663 | |
| birefringence | δ = 0.033–0.037 |
| pleochroism | Strong: X = colorless, Y = blue, Z = darker blue |
| 2V | Measured: 61–70° |
| fusibility | Infusible |
| solubility | Insoluble |
| references |
(same H–M symbol) c = 7.228(1) [Å]; β = 120.5(1)°; Z = 2 nβ = 1.626–1.654 nγ = 1.637–1.663 | length fast/slow =
Lazulite or Azure spar is a transparent to semi-opaque, blue mineral that is a phosphate of magnesium, iron, and aluminium, with the chemical formula . Lazulite forms one endmember of a solid solution series with the darker, iron-rich scorzalite.
Lazulite crystallizes in the monoclinic system. Its crystal habits include steep bipyramidal or wedge-shaped crystals. Lazulite has a Mohs hardness of 5.5–6.0 and a specific gravity of 3.0–3.1. It is infusible and insoluble.
Occurrence and discovery
Lazulite forms by high-grade metamorphism of silica-rich rocks and in pegmatites. It occurs in association with quartz, andalusite, rutile, kyanite, corundum, muscovite, pyrophyllite, dumortierite, wagnerite, svanbergite, trolleite, and berlinite in metamorphic terrains; and with albite, quartz, muscovite, tourmaline and beryl in pegmatites. It may be confused with lazurite, lapis lazuli or azurite.
The type locality is in Freßnitzgraben in Krieglach, it's also found in Salzburg, Austria; Zermatt, Switzerland; Minas Gerais, Brazil; Lincoln County, Georgia; Inyo County, California; the Yukon in Canada; and elsewhere.
It was first described in 1795 for deposits in Styria, Austria. or from the Arabic for heaven.
References
References
- Warr, L. N.. (2021). "IMA–CNMNC approved mineral symbols". [[Mineralogical Society of Great Britain and Ireland]].
- "Lazulite Mineral Data".
- ''Krivovichev V. G.'' Mineralogical glossary. Scientific editor [[:uk:Булах Андрій Глібович. A. G. Bulakh]]. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. ''(in Russian)''
- {{Mindat
- "Lazulite". Minerals.net.
- (1985). "Manual of Mineralogy". [[Wiley (publisher).
- "Lazulite". RRUFF.
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