Scorzalite Mineral Data

Scorzalite Mineral Data +

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General Scorzalite Information

Chemical Formula:

(Fe++,Mg)Al2(PO4)2(OH)2

Composition:

Molecular Weight = 325.88 gm

Magnesium 1.86 % Mg 3.09 % MgO

Aluminum 16.56 % Al 31.29 % Al₂O₃

Iron 12.85 % Fe 16.54 % FeO

Phosphorus 19.01 % P 43.56 % P₂O₅

Hydrogen 0.62 % H 5.53 % H₂O

Oxygen 49.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.75Mg_0.25Al₂(PO₄)₂(OH)₂

Environment:

Highly aluminous metamorphic rocks and granitic pegmatites. Forms a series with lazulite.

IMA Status:

Valid Species (Pre-IMA) 1947

Locality:

Corrego Firo pegmatite, Minas Gerias, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for Everisto Pena Scorza (1899-?), Brazilian mineralogist, Mineral Survey of Brazil.

Synonym:

ICSD 26497

PDF 35-632

Scorzalite Image

Images:

Scorzalite

Comments: Deep blue scorzalite with muscovite, quartz, and feldspar in matrix.
Location: Polermo Mine, North Groten, New Hampshire, USA. Scale: 5 x 3.5 cm.
© John Veevaert

Scorzalite Crystallography

Axial Ratios:

a:b:c =0.9801:1:0.9926

Cell Dimensions:

a = 7.1568, b = 7.3018, c = 7.2481, Z = 2; beta = 120.588° V = 326.06 Den(Calc)= 3.32

Crystal System:

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

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

By Intensity(I/I_o): 3.206(1), 3.246(0.75), 3.152(0.5),

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

Physical Properties of Scorzalite

Cleavage:

[110] Good

Color:

Dark blue, Greenish blue.

Density:

3.27

Diaphaniety:

Subtranslucent to Opaque

Fracture:

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

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Scorzalite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1936,KPDmeas= 0.1965,KC= 0.2005

Optical Data:

Biaxial (-), a=1.604-1.639, b=1.626-1.67, g=1.637-1.68, bire=0.0330-0.0410, 2V(Calc)=58-68, 2V(Meas)=62. Dispersion r > v.

Pleochroism (x):

colorless.

Pleochroism (y):

blue.

Pleochroism (z):

darker blue.

Calculated Properties of Scorzalite

Electron Density:

r_electron=3.22 gm/cc
note: r_Scorzalite=3.27 gm/cc.

Fermion Index

Fermion Index = 0.00482
Boson Index = 0.99518

Photoelectric:

PE_Scorzalite= 5.24 barns/electron
U=PE_Scorzalite x r_electron= 16.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Scorzalite is Not Radioactive

Scorzalite Classification

Dana Class:

41.10.1.2 (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.08-30 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 Scorzalite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)

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Scorzalite

(Fe++,Mg)Al2(PO4)2(OH)2
Dana No: 41.10.1.2 Strunz No: VII/B.08-30
Locality:

Notes: