Ransomite
A valid IMA mineral species - grandfathered
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About Ransomite
Formula:
CuFe2(SO4)4 · 6H2O
Colour:
Bright sky-blue; pale blue in transmitted light
Lustre:
Vitreous, Pearly
Hardness:
2½
Specific Gravity:
2.632
Crystal System:
Monoclinic
Name:
Named by Carl B. Lausen in 1928 in honor of Frederick Leslie Ransome (December 2, 1868 Greenwich, England, UK - October 6, 1935 Pasadena, California, USA), Professor of Economic Geology at the California Institute of Technology. Earlier, he worked at the University of Arizona and the United States Geological Survey.
This page provides mineralogical data about Ransomite.
Unique Identifiers
Mindat ID:
3364
Long-form identifier:
mindat:1:1:3364:6
GUID
(UUID V4):
(UUID V4):
b8ff6a76-f53e-4a65-9374-36c713807c0b
IMA Classification of Ransomite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CuFe3+2(SO4)4 · 6H2O
First published:
1928
Classification of Ransomite
7.CB.80
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
29.7.1.1
29 : HYDRATED ACID AND NORMAL SULFATES
7 : AB2(XO4)4·H2O
29 : HYDRATED ACID AND NORMAL SULFATES
7 : AB2(XO4)4·H2O
25.2.24
25 : Sulphates
2 : Sulphates of Cu and Ag
25 : Sulphates
2 : Sulphates of Cu and Ag
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Rns | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Ransomite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Ransomite
Vitreous, Pearly
Transparency:
Transparent
Comment:
Pearly on cleavages
Colour:
Bright sky-blue; pale blue in transmitted light
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
Perfect on {001}
Perfect on {001}
Density:
2.632 g/cm3 (Measured) 2.735 g/cm3 (Calculated)
Optical Data of Ransomite
Type:
Biaxial (+)
RI values:
nα = 1.631(5) nβ = 1.643(5) nγ = 1.695(5)
Max Birefringence:
δ = 0.064
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v strong
Chemistry of Ransomite
Mindat Formula:
CuFe2(SO4)4 · 6H2O
Common Impurities:
Al
Crystallography of Ransomite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 4.811(2) Å, b = 16.217(4) Å, c = 10.403(2) Å
β = 93.01(2)°
β = 93.01(2)°
Ratio:
a:b:c = 0.297 : 1 : 0.641
Unit Cell V:
810.52 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Slender prisms elongated parallel to the c axis. Rich in forms including: {110} (dominant), {111}, {211}, {311}, {301}, {053}, {010}, {110}, {210}.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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2D | Stereo | Red-Blue | Red-Cyan
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2D | Stereo | Red-Blue | Red-Cyan
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CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000203 | Ransomite | Wood M M (1970) The crystal structure of ransomite American Mineralogist 55 729-734 | 1970 | United Verde mine, Jerome, Arizona, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
- Å | () |
Comments:
No published XRD data.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Ransomite
General Appearance of Type Material:
Crusts and radiating tufts.
Place of Conservation of Type Material:
The Natural History Museum, London, England, number 1985,401.
Mineral Museum, University of Arizona, USA, number M50.
Harvard University, Cambridge, Massachusetts, USA, number 90541.
National Museum of Natural History, Washington, D.C., USA, number 95955.
Mineral Museum, University of Arizona, USA, number M50.
Harvard University, Cambridge, Massachusetts, USA, number 90541.
National Museum of Natural History, Washington, D.C., USA, number 95955.
Geological Setting of Type Material:
Burning pyritic ore body.
Associated Minerals at Type Locality:
Reference:
Lausen, C. (1928) Hydrous sulphates formed under fumerolic conditions at the United Verde Mine. American Mineralogist: 13(6): 203-229.
Other Language Names for Ransomite
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Ransomite associated with Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
1 photo of Ransomite associated with Guildite | CuFe3+(SO4)2(OH) · 4H2O |
Related Minerals - Strunz-mindat Grouping
7.CB. | Sarvodaite | Al2(SO4)3 · 5H2O |
7.CB.02 | Voudourisite | CdSO4 · H2O |
7.CB.05 | Dwornikite | Ni(SO4) · H2O |
7.CB.05 | Gunningite | ZnSO4 · H2O |
7.CB.05 | Kieserite | MgSO4 · H2O |
7.CB.05 | Poitevinite | (Cu,Fe)SO4 · H2O |
7.CB.05 | Szmikite | MnSO4 · H2O |
7.CB.05 | Szomolnokite | FeSO4 · H2O |
7.CB.05 | Cobaltkieserite | CoSO4 · H2O |
7.CB.07 | Sanderite | MgSO4 · 2H2O |
7.CB.10 | Bonattite | CuSO4 · 3H2O |
7.CB.12 | Belogubite | CuZn(SO4)2 · 10H2O |
7.CB.15 | Aplowite | (Co,Mn,Ni)SO4 · 4H2O |
7.CB.15 | Boyleite | (Zn,Mg)SO4 · 4H2O |
7.CB.15 | Ilesite | (Mn,Zn,Fe)SO4 · 4H2O |
7.CB.15 | Rozenite | FeSO4 · 4H2O |
7.CB.15 | Starkeyite | MgSO4 · 4H2O |
7.CB.15 | Drobecite | CdSO4 · 4H2O |
7.CB.15 | Cranswickite | MgSO4 · 4H2O |
7.CB.20 | Chalcanthite | CuSO4 · 5H2O |
7.CB.20 | Jôkokuite | MnSO4 · 5H2O |
7.CB.20 | Pentahydrite | MgSO4 · 5H2O |
7.CB.20 | Siderotil | FeSO4 · 5H2O |
7.CB.25 | Bianchite | Zn(SO4) · 6H2O |
7.CB.25 | Chvaleticeite | Mn(SO4) · 6H2O |
7.CB.25 | Ferrohexahydrite | FeSO4 · 6H2O |
7.CB.25 | Hexahydrite | MgSO4 · 6H2O |
7.CB.25 | Moorhouseite | Co(SO4) · 6H2O |
7.CB.25 | Nickelhexahydrite | Ni(SO4) · 6H2O |
7.CB.30 | Retgersite | NiSO4 · 6H2O |
7.CB.35 | Bieberite | CoSO4 · 7H2O |
7.CB.35 | Boothite | CuSO4 · 7H2O |
7.CB.35 | Mallardite | MnSO4 · 7H2O |
7.CB.35 | Melanterite | Fe2+(H2O)6SO4 · H2O |
7.CB.35 | Zincmelanterite | (Zn,Cu,Fe)SO4 · 7H2O |
7.CB.35 | Alpersite | (Mg,Cu)(SO4) · 7H2O |
7.CB.40 | Epsomite | MgSO4 · 7H2O |
7.CB.40 | Goslarite | ZnSO4 · 7H2O |
7.CB.40 | Morenosite | NiSO4 · 7H2O |
7.CB.45 | Alunogen | Al2(SO4)3 · 17H2O |
7.CB.45 | Meta-alunogen | Al2(SO4)3 · 12H2O |
7.CB.50 | Aluminocoquimbite | Al2Fe2(SO4)6(H2O)12 · 6H2O |
7.CB.50 | Lazaridisite | 3CdSO4 · 8H2O |
7.CB.52 | Pararaisaite | CuMg[Te6+O4(OH)2] · 6H2O |
7.CB.55 | Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
7.CB.55 | Paracoquimbite | Fe4(SO4)6(H2O)12 · 6H2O |
7.CB.55 | Rhomboclase | (H5O2)Fe3+(SO4)2 · 2H2O |
7.CB.55 | Raisaite | CuMg[Te6+O4(OH)2] · 6H2O |
7.CB.57 | Caichengyunite | Fe2+3Al2(SO4)6 · 30H2O |
7.CB.60 | Kornelite | Fe2(SO4)3 · 7H2O |
7.CB.65 | Quenstedtite | Fe2(SO4)3 · 11H2O |
7.CB.70 | Lausenite | Fe2(SO4)3 · 5H2O |
7.CB.75 | Lishizhenite | ZnFe2(SO4)4 · 14H2O |
7.CB.75 | Römerite | Fe2+Fe3+2(SO4)4 · 14H2O |
7.CB.85 | Apjohnite | Mn2+Al2(SO4)4 · 22H2O |
7.CB.85 | Bílinite | Fe2+Fe3+2(SO4)4 · 22H2O |
7.CB.85 | Dietrichite | (Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O |
7.CB.85 | Halotrichite | FeAl2(SO4)4 · 22H2O |
7.CB.85 | Pickeringite | MgAl2(SO4)4 · 22H2O |
7.CB.85 | Redingtonite | (Fe2+,Mg,Ni)(Cr,Al)2(SO4)4 · 22H2O |
7.CB.85 | Wupatkiite | (Co,Mg,Ni)Al2(SO4)4 · 22H2O |
7.CB.90 | Meridianiite | MgSO4 · 11H2O |
Other Information
Notes:
Soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ransomite
mindat.org URL:
https://www.mindat.org/min-3364.html
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References for Ransomite
Reference List:
Localities for Ransomite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Greece | |
| |
Branko Rieck collection | |
Italy | |
| Gunnar Farber December 2021 mineral list |
USA | |
| Graeme (1981) |
Anthony et al. (1995) | |
Anthony et al. (1995) | |
| Lausen (1928) +4 other references |
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United Verde Mine, Jerome, Verde Mining District, Black Hills, Yavapai County, Arizona, USA