Ransomite Mineral Data

General Ransomite Information

Chemical Formula:

CuFe+++2(SO4)4•6(H2O)

Composition:

Molecular Weight = 667.59 gm

Iron 16.73 % Fe 23.92 % Fe₂O₃

Copper 9.52 % Cu 11.92 % CuO

Hydrogen 1.81 % H 16.19 % H₂O

Sulfur 19.21 % S 47.97 % SO₃

Oxygen 52.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuFe³⁺₂(SO₄)₄•6(H₂O)

Environment:

Hydrated sulfate formed as the result of a mine fire in a copper mine.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

United Verde mine, Jerome, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Federick Leslie Ransome (1868-1935), U.S. Mining geologist.

Name Pronunciation:

Ransomite + Pronunciation

Synonym:

ICSD 15177

PDF 71-2375

Ransomite Image

Images:

Ransomite

Comments: Pale bluish-green powdery ransomite.
Location: United Verde Mine, Jerome, Black Hills, Verde District, Yavapai Co., Arizona, USA. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Ransomite Crystallography

Axial Ratios:

a:b:c =0.2966:1:0.6414

Cell Dimensions:

a = 4.811, b = 16.217, c = 10.403, Z = 2; beta = 93.017° V = 810.52 Den(Calc)= 2.74

Crystal System:

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

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wood M M , American Mineralogist , 55 (1970) p.729-734, The crystal structure of ransomite

Physical Properties of Ransomite

Cleavage:

{001} Perfect

Color:

Blue.

Density:

2.63

Diaphaneity:

Transparent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

bluish white

Optical Properties of Ransomite

Gladstone-Dale:

CI meas= -0.059 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2395,KPDmeas= 0.2496,KC= 0.2356
Ncalc = 1.62 - 1.65

Optical Data:

Biaxial (+), a=1.631, b=1.643, g=1.695, bire=0.0640

Calculated Properties of Ransomite

Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Ransomite =2.74 gm/cc.

Fermion Index:

Fermion Index = 0.0052437594
Boson Index = 0.9947562406

Photoelectric:

PE_Ransomite= 10.12 barns/electron
U=PE_Ransomite x rElectron Density= 27.68 barns/cc.

Radioactivity:

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

Ransomite Classification

Dana Class:

29.07.01.01 (29)Hydrated Acid and Sulfates

(29.07)where A (B)2 (XO4)4 · x(H2O)

(29.07.01)Dana Group

29.07.01.01 Ransomite CuFe2(SO4)4•6(H2O) P 2₁/c 2/m

Strunz Class:

07.CB.80 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.80 Ransomite CuFe2(SO4)4•6(H2O) P 2₁/c 2/m

Other Ransomite Information

References:

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

See Also:

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

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Ask about Ransomite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Ransomite

CuFe+++2(SO4)4•6(H2O)
Dana No: 29.07.01.01 Strunz No: 07.CB.80
Locality:

Notes: