Lazulite Mineral Data

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."

Name Pronunciation:

Lazulite

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

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.54 - 1.63

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:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Lazulite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.0082971147
Boson Index = 0.9917028853

Photoelectric:

PE_Lazulite= 1.69 barns/electron
U=PE_Lazulite x rElectron Density= 5.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lazulite is Not Radioactive

Lazulite Classification

Dana Class:

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

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

(41.10.01)Lazulite Group

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

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

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

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

Strunz Class:

08.BB.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

Other Lazulite Information

References:

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

See Also:

Links to other databases for Lazulite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - Philatelic Mineralogy
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - Tradeshop.com - The Rainbow of Gems
19 - WWW-MINCRYST
20 - YupRocks
21 - theimage

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

Lazulite

MgAl2(PO4)2(OH)2
Dana No: 41.10.01.01 Strunz No: 08.BB.40
Locality:

Notes: