Lazulite Mineral Data

Lazulite Mineral Data +

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General Lazulite Information

Chemical Formula:

MgAl2(PO4)2(OH)2

Composition:

Molecular Weight = 302.23 gm

Magnesium 8.04 % Mg 13.34 % MgO

Aluminum 17.86 % Al 33.74 % Al₂O₃

Phosphorus 20.50 % P 46.97 % P₂O₅

Hydrogen 0.67 % H 5.96 % H₂O

Oxygen 52.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgAl₂(PO₄)₂(OH)₂

IMA Status:

Valid Species (Pre-IMA) 1795

Locality:

Werfen, Salzburg, Austria Link to MinDat.org Location Data.

Name Origin:

From the Arabic azul - "sky" and the Greek lithos - "stone."

Synonym:

Blue spar

ICSD 31259

Klaprothite

PDF 34-136

Lazulite Image

Images:

Lazulite Bystrite

Comments: Brownish-yellow bystrite grains with blue lazulite in an igneous rock.
Location: Malo-Bystrinskoye lazurite deposit, Tunka Valley, Sludyanka, Lake Baikal Region, Russia. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Lazulite

Comments: Lustrous dark blackish-blue crystals of lazulite to 5 mm in size.
Location: Crosscut Creek, Rapid Creek, Yukon Territory, Canada. Scale: 3 x 4.2 x 1.5 cm.
© Dan Weinrich

Images:

Lazulite Whiteite-(CaMnMg)

Comments: Light beige-colored whiteite-(CaMnMg) crystal perched on dark blue lazulite.
Location: Rapid Creek, Yukon Territory, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Lazulite Trolleite

Comments: Pale blue trolleite with darker blue lazulite.
Location: Champion Mine, White Mountains, Mono County, California. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lazulite Crystallography

Axial Ratios:

a:b:c =0.9827:1:0.9938

Cell Dimensions:

a = 7.1526, b = 7.278, c = 7.2334, Z = 2; beta = 89.233° V = 376.51 Den(Calc)= 2.67

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.24(1), 3.206(0.85), 3.08(0.7),

Forms:

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Forms: [ 1 1 1] [ 1 0 1]

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Crystal Structure:

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Lindberg M L , Christ C L , Acta Crystallographica , 12 (1959) p.695-697, Crystal structures of the isostructural minerals lazulite,, scorzalite and barbosalite

View Additional jPOWD Structure files for Lazulite
[1]

Physical Properties of Lazulite

Cleavage:

[001] Indistinct, [???] Indistinct

Color:

Blue, Blue green, Light blue, Black blue.

Density:

3 - 3.1, Average = 3.05

Diaphaniety:

Subtranslucent to opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lazulite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.188 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2408,KPDmeas= 0.2108,KC= 0.2027

Optical Data:

Biaxial (-), a=1.604-1.637, b=1.631-1.667, g=1.642-1.677, bire=0.0380-0.0400, 2V(Calc)=58-64, 2V(Meas)=61-70. Dispersion weak, r < v.

Pleochroism (x):

colorless or colorless.

Pleochroism (y):

light blue or greenish blue.

Pleochroism (z):

light blue or greenish blue.

Calculated Properties of Lazulite

Electron Density:

r_electron=3.03 gm/cc
note: r_Lazulite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00829
Boson Index = 0.99171

Photoelectric:

PE_Lazulite= 1.69 barns/electron
U=PE_Lazulite x r_electron= 5.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lazulite is Not Radioactive

Lazulite Classification

Dana Class:

41.10.1.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.1)Dana Group

41.10.1.1 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

41.10.1.2 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

41.10.1.3 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

41.10.1.4 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

Strunz Class:

VII/B.08-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.08 - Lazulite group, Trolleite - Richellite

VII/B.08-10 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

VII/B.08-20 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-30 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

VII/B.08-40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-50 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

VII/B.08-55 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

VII/B.08-60 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

VII/B.08-70 Richellite Ca3Fe10(PO4)8(OH)12·n(H2O) P 4 4

Other Lazulite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Print or Cut-and-Paste your Lazulite Specimen Label here :

Lazulite

MgAl2(PO4)2(OH)2
Dana No: 41.10.1.1 Strunz No: VII/B.08-20
Locality:

Notes: