Lulzacite Mineral Data

General Lulzacite Information

Chemical Formula:

Sr2Fe++(Fe++,Mg)2Al4(PO4)4(OH)10

Composition:

Molecular Weight = 975.43 gm

Strontium 17.97 % Sr 21.25 % SrO

Magnesium 1.99 % Mg 3.31 % MgO

Aluminum 11.06 % Al 20.91 % Al₂O₃

Iron 12.60 % Fe 16.20 % FeO

Phosphorus 12.70 % P 29.10 % P₂O₅

Hydrogen 1.03 % H 9.23 % H₂O

Oxygen 42.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr₂Fe²⁺_2.2Mg_0.8Al₄(PO₄)₄(OH)₁₀

Environment:

Quartz veinlets at the contact between Ordovician quartzite and limestone.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

In a quarry 8 km west of Chateaubriant, Loire-Atlanique region, France. Link to MinDat.org Location Data.

Name Origin:

Named for mining geologist Y. Lulzac (1934-) of the BRGM who discovered the mineral.

Synonym:

ICSD 89901

IMA1998-039

Lulzacite Image

Images:

Lulzacite

Comments: Dark gray siderite with grayish green lulzacite.
Location: St. Aubindes Chateaux, Loire, France. Scale: 1.7 x 1.4 cm.
© John Veevaert

Lulzacite Crystallography

Axial Ratios:

a:b:c =0.5976:1:1.0698

Cell Dimensions:

a = 5.457, b = 9.131, c = 9.769, Z = 1; alpha = 108.47°, beta = 91.72°, gamma = 97.44° V = 457.60 Den(Calc)= 3.54

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.218(1)(122), 3.132(0.62)(120), 2.8119(0.58)(113), 3.016(0.56)(122), 3.591(0.5)(111), 4.473(0.47)(021), 3.47(0.45), 2.6526(0.44)(13

Physical Properties of Lulzacite

Cleavage:

None

Color:

Grayish green, Dark yellow green.

Density:

3.55

Diaphaneity:

Transparent to Translucent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Lulzacite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1889,KPDmeas= 0.1889,KC= 0.1958
Ncalc = 1.7

Optical Data:

Biaxial (-), a=1.654, b=1.674, g=1.684, bire=0.0300, 2V(Calc)=68, 2V(Meas)=45-65. Dispersion r < v distinct.

Calculated Properties of Lulzacite

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Lulzacite =3.55 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Lulzacite= 24.37 barns/electron
U=PE_Lulzacite x rElectron Density= 83.87 barns/cc.

Radioactivity:

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

Lulzacite Classification

Dana Class:

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

(41.07)where (A B)m (XO4)4 Zq

(41.07.04)Dana Group

41.07.04.01 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

Strunz Class:

08.BK.25 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BK -With medium-sized and large cations, (OH, etc.)

08.BK.25 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

08.BK.25 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

Other Lulzacite Information

References:

NAME( AmMin, Vol 86, p 1844) PHYS. PROP.(AmMin, Vol 86, p 1844) OPTIC PROP.(AmMin, Vol 86, p 1844)

See Also:

Links to other databases for Lulzacite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Lulzacite

Sr2Fe++(Fe++,Mg)2Al4(PO4)4(OH)10
Dana No: 41.07.04.01 Strunz No: 08.BK.25
Locality:

Notes:

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