Ransomite Mineral Data

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.

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:

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Ransomite

Electron Density:

r_electron=2.73 gm/cc
note: r_Ransomite=2.74 gm/cc.

Fermion Index

Fermion Index = 0.00524
Boson Index = 0.99476

Photoelectric:

PE_Ransomite= 10.12 barns/electron
U=PE_Ransomite x r_electron= 27.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ransomite is Not Radioactive

Ransomite Classification

Dana Class:

29.7.1.1 (29)Hydrated Acid and Sulfates

(29.7)where A (B)2 (XO4)4 · x(H2O)

(29.7.1)Dana Group

29.7.1.1 Ransomite CuFe2(SO4)4·6(H2O) P 2₁/c 2/m

Strunz Class:

VI/C.11-20 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.11 - Römerite - Ransomite series

VI/C.11-10 Romerite Fe3(SO4)4·14(H2O) P1 1

VI/C.11-15 Lishizhenite ZnFe2(SO4)4·14(H2O) P1 1

VI/C.11-20 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Ransomite

CuFe+++2(SO4)4·6(H2O)
Dana No: 29.7.1.1 Strunz No: VI/C.11-20
Locality:

Notes: