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Lazulite

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Formula:
(Mg,Fe2+)Al2(PO4)2(OH)2
System:
Monoclinic
Colour:
Blue, sky-blue, bluish ...
Hardness:
5½ - 6
Member of:
Name:
Named in 1795 by Marten H. Klaproth from the Arabic word meaning "heaven," in allusion to its colour.
The magnesium analogue of Scorzalite.

Not to be confused with the similarly named lazurite.

Visit gemdat.org for gemological information about Lazulite.

Classification of Lazulite

Approved
8.BB.40

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
41.10.1.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
10 : (AB)3(XO4)2Zq
19.14.29

19 : Phosphates
14 : Phosphates of Fe and other metals
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http://www.mindat.org/min-2356.html
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First Recorded Occurrence of Lazulite

Place of Conservation of First Recorded Material:
Natural History Museum, London 83304
Year of Discovery:
1795
Associated Minerals at First Recorded Locality:

Occurrences of Lazulite

Geological Setting:
In metamorphic rocks, border zones of complex granitic pegmatites, alluvial deposits.

Physical Properties of Lazulite

Vitreous, Sub-Vitreous, Resinous, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Blue, sky-blue, bluish white
Streak:
White
Hardness (Mohs):
5½ - 6
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Poor to good {110}
Indistinct on {101}
Fracture:
Irregular/Uneven, Splintery
Density:
3.122 - 3.24 g/cm3 (Measured)    3.144 g/cm3 (Calculated)

Crystallography of Lazulite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 7.144(1) Å, b = 7.278(1) Å, c = 7.228(1) Å
β = 120.5(1)°
Ratio:
a:b:c = 0.982 : 1 : 0.993
Unit Cell Volume:
V 323.81 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals commonly acute to stubby dipyramidal with large {111} and {111}, and small {101}; also tabular on (111) or (101). Granular to compact massive.
Twinning:
Common on {100}, lamellar or polysynthetic at times, with composition plane {001} or {100} and usually with a re-entrant angle; rare on {223}, by reflection on {221}. Reported also on {210} and {021}.

Crystallographic forms of Lazulite

Crystal Atlas:
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Lazulite no.3 - Goldschmidt (1913-1926)
Lazulite no.11 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.73 (18)
3.23 (100)
3.20 (59)
3.14 (55)
3.077 (42)
2.548 (18)
1.571 (18)

Optical Data of Lazulite

Type:
Biaxial (-)
RI values:
nα = 1.604 - 1.626 nβ = 1.626 - 1.654 nγ = 1.637 - 1.663
2V:
Measured: 61° to 70°, Calculated: 58° to 64°
Birefringence:
0.035
Max Birefringence:
δ = 0.033 - 0.037
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak
Optical Extinction:
Y = b; X ^ c = 10°
Pleochroism:
Strong
Comments:
X= Colourless
Y= Blue
Z= Darker blue

Chemical Properties of Lazulite

Formula:
(Mg,Fe2+)Al2(PO4)2(OH)2
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Mn

Relationship of Lazulite to other Species

Series:
Forms a series with Scorzalite (see here)
Member of:
Other Members of Group:
BarbosaliteFe2+Fe23+(PO4)2(OH)2
HentscheliteCuFe23+(PO4)2(OH)2
ScorzaliteFe2+Al2(PO4)2(OH)2
WilhelmkleiniteZnFe23+(AsO4)2(OH)2
8.BB.05AmblygoniteLiAl(PO4)F
8.BB.05MontebrasiteLiAl(PO4)(OH)
8.BB.05TavoriteLiFe3+(PO4)(OH)
8.BB.10Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
8.BB.10Zwieselite(Fe2+,Mn2+)2(PO4)F
8.BB.15SarkiniteMn22+(AsO4)(OH)
8.BB.15Triploidite(Mn2+,Fe2+)2(PO4)(OH)
8.BB.15Wagnerite(Mg,Fe2+)2(PO4)F
8.BB.15Wolfeite(Fe2+,Mn2+)2(PO4)(OH)
8.BB.15Stanĕkite(Mn2+,Fe2+,Mg)Fe3+(PO4)O
8.BB.15JoosteiteMn2+(Mn3+,Fe3+)(PO4)O
8.BB.15HydroxylwagneriteMg2(PO4)(OH)
8.BB.20HoltedahliteMg2(PO4)(OH)
8.BB.20Satterlyite(Fe2+,Mg,Fe3+)2(PO4)(OH,O)
8.BB.25AlthausiteMg4(PO4)2(OH,O)(F,☐)
8.BB.30AdamiteZn2(AsO4)(OH)
8.BB.30EveiteMn22+(AsO4)(OH)
8.BB.30LibetheniteCu2(PO4)(OH)
8.BB.30OliveniteCu2(AsO4)(OH)
8.BB.30ZincolibetheniteCuZn(PO4)(OH)
8.BB.30ZincoliveniteCuZn(AsO4)(OH)
8.BB.30AuriacusiteFe3+Cu2+(AsO4)O
8.BB.35ParadamiteZn2(AsO4)(OH)
8.BB.35TarbuttiteZn2(PO4)(OH)
8.BB.40BarbosaliteFe2+Fe23+(PO4)2(OH)2
8.BB.40HentscheliteCuFe23+(PO4)2(OH)2
8.BB.40ScorzaliteFe2+Al2(PO4)2(OH)2
8.BB.40WilhelmkleiniteZnFe23+(AsO4)2(OH)2
8.BB.45TrolleiteAl4(PO4)3(OH)3
8.BB.50NamibiteCu(BiO)2(VO4)(OH)
8.BB.55PhosphoellenbergeriteMg14(PO4)6(HPO4,CO3)2(OH)6
8.BB.60UrusoviteCuAl(AsO4)O
8.BB.65TheoparacelsiteCu3(As2O7)(OH)2
8.BB.70TuraniteCu5(VO4)2(OH)4
8.BB.75StoiberiteCu5(VO4)2O2
8.BB.80FingeriteCu11(VO4)6O2
8.BB.85AverieviteCu6(VO4)2O2Cl2
8.BB.90LipscombiteFe2+Fe23+(PO4)2(OH)2
8.BB.90RichelliteCaFe23+(PO4)2(OH,F)2
8.BB.90ZinclipscombiteZnFe23+(PO4)2(OH)2
19.14.1CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
19.14.2KidwelliteNaFe93+(PO4)6(OH)11 · 3H2O
19.14.3Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3
19.14.4Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3
19.14.5Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
19.14.6NatrodufréniteNaFe2+Fe53+(PO4)4(OH)6 · 2H2O
19.14.7LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
19.14.8Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
19.14.9BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2O
19.14.10Satterlyite(Fe2+,Mg,Fe3+)2(PO4)(OH,O)
19.14.11UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
19.14.13ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2
19.14.14AnapaiteCa2Fe2+(PO4)2 · 4H2O
19.14.15XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
19.14.16CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
19.14.17MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
19.14.18MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
19.14.19DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed ·
19.14.20CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
19.14.21SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
19.14.22KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
19.14.23VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
19.14.24MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.25ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.26SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
19.14.27CacoxeniteFe243+Al(PO4)17O6(OH)12 · 17H2O
19.14.28KoninckiteFe3+PO4 · 3H2O
19.14.30ScorzaliteFe2+Al2(PO4)2(OH)2
19.14.31Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.32Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.33ZaïriteBi(Fe3+,Al)3(PO4)2(OH)6

Other Names for Lazulite

Other Information

Not fluorescent in UV
Other Information:
Slowly soluble in hot acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Lazulite

Reference List:
Widenmann (1791) Bergmaennusches Journal, Freiberg (Neues Bergmannische Journal): 346 (as Himmelblau Fossil von Steiermark).

Stütz (1791) Schriften der Gesellschaft naturforschender Freunde in Berlin: 9: 352 (as Smalteblaue Fossil von Vorau).

Klaproth (1792) Schriften der Gesellschaft naturforschender Freunde in Berlin: 10: 90 (as Lazulit).

Stütz (1793) Einricht. Nat. Wien: 49 (as Unächter Lasurstein).

Klaproth (1795) Beitr. Chem.. Kenntn. Min.: 1: 197 (as Lazulit).

Klaproth (1795) Klaproth, M.H. (1795) Beiträge zur chemischen Kenntniss der Mineralkörper. Vol. 1: 197 (as Dichter blauer Feldspath).

von Moll (1799) Berg.- und hüttenmännisches Jahrbuch, Vienna: 4: 71 (as Wahrscheinlich neue Fossil aus Salzburg).

Haberle (1804) Handbuch (as Mollit).

Mohs, F. (1804) Des Herrn J.F. Null Mineralien-Kabinet, nach einem, durchaus auf aussere Kennzeichnen gegründeten Systeme geordnet. 3 abthl., Vienna: 1: 427 (as Lazulith [of Mohs]).

Jameson, R. (1805) Treatise on the External Characters of Minerals. Edinburgh: 2: 542 (as Azurite).

Klaproth, M.H. (1807) Beiträge zur chemischen Kenntniss der Mineralkörpers, vol. 4: 279 (as Lazulith).

Delamétherie, J.C. (1812) Leçons de minéralogie. 8vo, Paris, volume 2 (as Voraulite).

Fuchs (1818) Journal für Chemie und Physik, Nuremberg: 24: 373 (as Phosphorsäure Thonerde).

Beudant, F.S. (1824), Trailé élémentaire de Minéralogie, Paris: 464 (as Klaprothite).

Beudant, F.S. (1832), Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 576 (as Klaprothine).

Prüfer (1847) Naturwissenschaftliche Abhandlungen, Vienna: 1: 169.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 798.

Goldschmidt, V. (1916) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 5 (3?): 131.

Watson (1921) Journal of the Washington Academy of Science: 11: 386.

Kerr (1926) Jeweler’s Circ.: 92: 67 (as Berkeyite).

Hintze, Carl (1933) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 1132; 1 [4B]: 1126.

Meixner (1937) Berg.- und hüttenmännisches Jahrbuch, Montan. Hochsch. Leoben: 85, 1, 33.

Baier (1941) Zentralblatt Mineralien: 145.

Berry (1948) American Mineralogist: 33: 750.

Pecora, W.T. and Fahey, J.J. (1949) American Mineralogist: 34: 83, 684.

Pecora, W.T. and Fahey, J.J. (1950) The lazulite-scorzalite isomorphous series. American Mineralogist 35, 1-18.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 908-911.

Neues Jahrbuch für Mineralogie, Monatshefte (1983): 410-416.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680 pp.: 307.

Internet Links for Lazulite

Specimens:
The following Lazulite specimens are currently listed for sale on minfind.com.

Localities for Lazulite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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