Tamarugite Mineral Data

Tamarugite Mineral Data +

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General Tamarugite Information

Chemical Formula:

NaAl(SO4)2·6(H2O)

Composition:

Molecular Weight = 350.19 gm

Sodium 6.56 % Na 8.85 % Na₂O

Aluminum 7.70 % Al 14.56 % Al₂O₃

Hydrogen 3.45 % H 30.87 % H₂O

Sulfur 18.31 % S 45.73 % SO₃

Oxygen 63.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl(SO₄)₂·6(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1889

Locality:

Tamarugal Pampa, Cerro Pintado, Tarapaca, Chile Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 15187

PDF 19-1186

Tamarugite Image

Images:

Tamarugite Blodite

Comments: Clear, yellow bl?dite with white tamarugite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Tamarugite Metasideronatrite

Comments: Orange metasideronatrite with white tamarugite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Tamarugite

Comments: Small white flakes of Tamarugite.
Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Tamarugite Crystallography

Axial Ratios:

a:b:c =0.2914:1:0.2417

Cell Dimensions:

a = 7.353, b = 25.225, c = 6.097, Z = 4; beta = 95.2° V = 1,126.21 Den(Calc)= 2.07

Crystal System:

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

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

By Intensity(I/I_o): 4.223(1), 4.207(0.8), 3.647(0.59),

Forms:

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Forms: [ 1 2 1] [ 1 2 1] [ 0 3 1] [ 0 1 0] [ 1 2 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Robinson P D , Fang J H , American Mineralogist , 54 (1969) p.19-30, Crystal structures and mineral chemistry of double-salt hydrates: I. Direct, determination of the crystal structure of tamarugite

Physical Properties of Tamarugite

Cleavage:

[010] Perfect

Color:

Colorless.

Density:

2.06

Diaphaniety:

Transparent

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tamarugite

Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2362,KPDmeas= 0.2374,KC= 0.2328

Optical Data:

Biaxial (+), a=1.484, b=1.486, g=1.497, bire=0.0130, 2V(Calc)=48, 2V(Meas)=60.

Calculated Properties of Tamarugite

Electron Density:

r_electron=2.13 gm/cc
note: r_Tamarugite=2.07 gm/cc.

Fermion Index

Fermion Index = 0.00168
Boson Index = 0.99832

Photoelectric:

PE_Tamarugite= 1.51 barns/electron
U=PE_Tamarugite x r_electron= 3.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tamarugite is Not Radioactive

Tamarugite Classification

Dana Class:

29.5.3.1 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.3)Dana Group

29.5.3.1 Tamarugite NaAl(SO4)2·6(H2O) P 2₁/a 2/m

29.5.3.2 Amarillite NaFe(SO4)2·6(H2O) C 2/c 2/m

Strunz Class:

VI/C.15-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.15 - Krausite - Amarillite series

VI/C.15-10 Krausite KFe(SO4)2·(H2O) P 2₁/m 2/m

VI/C.15-20 Tamarugite NaAl(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.15-30 Amarillite NaFe(SO4)2·6(H2O) C 2/c 2/m

Other Tamarugite Information

References:

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

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Tamarugite

NaAl(SO4)2·6(H2O)
Dana No: 29.5.3.1 Strunz No: VI/C.15-20
Locality:

Notes: