Parabutlerite Mineral Data

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General Parabutlerite Information

Chemical Formula:

Fe+++(SO4)(OH)•2(H2O)

Composition:

Molecular Weight = 204.95 gm

Iron 27.25 % Fe 38.96 % Fe₂O₃

Hydrogen 2.46 % H 21.98 % H₂O

Sulfur 15.65 % S 39.07 % SO₃

Oxygen 54.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(SO₄)(OH)•2(H₂O)

Environment:

Alteration product of copapite.

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Alcaparrosa, near Cirritos Bayos, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek para, and it's dimorph, bulterite,

Name Pronunciation:

Parabutlerite + Pronunciation

Synonym:

ICSD 23506

PDF 16-939

Parabutlerite Image

Images:

Parabutlerite

Comments: Yellow to brownish yellow parabutlerite crystals.
Location: Shagand Yazd, Iran. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Parabutlerite Crystallography

Axial Ratios:

a:b:c =0.3666:1:0.3586

Cell Dimensions:

a = 7.38, b = 20.13, c = 7.22, Z = 8; V = 1,072.60 Den(Calc)= 2.54

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

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

By Intensity(I/I_o): 3.11(1), 4.99(1), 5.85(0.6),

Forms:

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Forms: ( 0 1 2) ( 1 1 1) ( 1 1 0) ( 0 1 1)

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Crystal Structure:

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Borene J , Bulletin de la Societe Francaise de Mineralogie et de Cristallographie , 93 (1970) p.185-189, Structure cristalline de la parabutlerite

Physical Properties of Parabutlerite

Cleavage:

{110} Indistinct

Color:

Light brown orange, Light orange, Orange brown.

Density:

2.55

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Parabutlerite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2623,KPDmeas= 0.2612,KC= 0.2666
Ncalc = 1.68

Optical Data:

Biaxial (+), a=1.589-1.598, b=1.66-1.663, g=1.737-1.75, bire=0.1480-0.1520, 2V(Calc)=86-88, 2V(Meas)=87. Dispersion r > v moderate.

Pleochroism (x):

colorless.

Pleochroism (y):

faint yellow.

Pleochroism (z):

light yellow.

Calculated Properties of Parabutlerite

Electron Density:

Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Parabutlerite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.0072162779
Boson Index = 0.9927837221

Photoelectric:

PE_{Parabutlerite}= 8.92 barns/electron
U=PE_{Parabutlerite} x rElectron Density= 22.76 barns/cc.

Radioactivity:

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

Parabutlerite Classification

Dana Class:

31.09.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zq·x(H2O)

(31.09.02)Dana Group

31.09.02.01 Parabutlerite Fe(SO4)(OH)•2(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

07.DC.10 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DC -With only medium-sized cations; chains of corner-sharing octahedra

07.DC.10 Butlerite Fe(SO4)(OH)•2(H2O) P 2₁/m 2/m

07.DC.10 Parabutlerite Fe(SO4)(OH)•2(H2O) Pmnb 2/m 2/m 2/m

Other Parabutlerite Information

References:

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

See Also:

Links to other databases for Parabutlerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Parabutlerite here :
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Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Parabutlerite

Fe+++(SO4)(OH)•2(H2O)
Dana No: 31.09.02.01 Strunz No: 07.DC.10
Locality:

Notes: