Hoganite
A valid IMA mineral species
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About Hoganite
Formula:
Cu(CH3COO)2 · H2O
Colour:
Bluish green
Lustre:
Vitreous
Hardness:
1½
Specific Gravity:
1.910 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Graham P. Hogan (b. 1957), of Broken Hill, Australia, miner and collector who found the first specimens.
A very rare naturally formed copper acetate.
See also the associated paceite.
Collectors should be aware that "hoganites" can form as the result of using acetic acid (vinegar) for cleaning copper-bearing mineral specimens, and are therefore anthropogenic - Caveat emptor. See the following discussions:
english: https://www.mineral-forum.com/message-board/viewtopic.php?t=5437
en español: https://www.foro-minerales.com/forum/viewtopic.php?t=13247
See also the associated paceite.
Collectors should be aware that "hoganites" can form as the result of using acetic acid (vinegar) for cleaning copper-bearing mineral specimens, and are therefore anthropogenic - Caveat emptor. See the following discussions:
english: https://www.mineral-forum.com/message-board/viewtopic.php?t=5437
en español: https://www.foro-minerales.com/forum/viewtopic.php?t=13247
Unique Identifiers
Mindat ID:
10919
Long-form identifier:
mindat:1:1:10919:4
GUID
(UUID V4):
(UUID V4):
84c78d9d-01f1-4c8e-a81c-d4af68d7ca67
IMA Classification of Hoganite
Approved
Classification of Hoganite
10.AA.35
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
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 |
|---|---|---|
| Hgn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hoganite
Vitreous
Transparency:
Transparent
Colour:
Bluish green
Streak:
Pale blue
Hardness:
1½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}; distinct on {110} (synthetic).
Perfect on {001}; distinct on {110} (synthetic).
Fracture:
Conchoidal
Density:
1.910 g/cm3 (Calculated)
Optical Data of Hoganite
Type:
Biaxial (+)
RI values:
nα = 1.533(2) nβ = 1.541(3) nγ = 1.554(2)
2V:
Measured: 85° (5), Calculated: 76.8°
Max Birefringence:
δ = 0.021
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:
Low
Dispersion:
r < v, medium.
Pleochroism:
Strong
Comments:
X = blue; Y = pale blue; Z = pale bluish green.
Comments:
Absorption: X > Y > Z.
Chemistry of Hoganite
Mindat Formula:
Cu(CH3COO)2 · H2O
Elements listed:
Crystallography of Hoganite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 13.845 Å, b = 8.528 Å, c = 13.197 Å
β = 117.08(3)°
β = 117.08(3)°
Ratio:
a:b:c = 1.623 : 1 : 1.547
Unit Cell V:
1,387.35 ų (Calculated from Unit Cell)
Z:
8
Twinning:
No twinning was observed in natural material but some synthetic crystals show butterfly-like twins.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0012426 | Hoganite | Meester P, Fletcher S R, Skapski A C (1973) Refined crystal structure of tetra-mu-acetato-bisaquodicopper (II) Dalton Transactions 1973 2575-2578 | 1973 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.921 Å | (100) |
| 3.532 Å | (28) |
| 6.176 Å | (14) |
| 3.592 Å | (11) |
| 5.382 Å | (10) |
| 2.278 Å | (10) |
| 5.872 Å | (9) |
Comments:
Potosi pit, Australia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Hoganite
General Appearance of Type Material:
Isolated, bluish green prisms up to 0.6 mm long.
Synonyms of Hoganite
Other Language Names for Hoganite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 10.AA. | Stanevansite | Mg(C2H3O3)2 · 2H2O |
| 10.AA. | Jimkrieghite | Ca(C2H3O3)2 |
| 10.AA. | Lianbinite | (NH4)(C2H3O3)(C2H4O3) |
| 10.AA. | Glecklerite | Na(C2H3O3) |
| 10.AA.05 | Formicaite | Ca(HCOO)2 |
| 10.AA.10 | Dashkovaite | Mg(HCOO)2 · 2H2O |
| 10.AA.20 | Acetamide | CH3CONH2 |
| 10.AA.25 | Calclacite | Ca(CH3COO)Cl · 5H2O |
| 10.AA.30 | Paceite | CaCu(CH3COO)4 · 6H2O |
| 10.AA.40 | Lazaraskeite | Cu(C2H3O3)2 |
| 10.AA.45 | Marchettiite | C5H7N5O3 |
Fluorescence of Hoganite
Not fluorescent.
Other Information
Thermal Behaviour:
Step 1 between 83 and 95°C
Step 2 at 222°C
Step 2 at 222°C
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 Hoganite
mindat.org URL:
https://www.mindat.org/min-10919.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Hoganite
Reference List:
Localities for Hoganite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Hibbs et al. (2002) |
Morocco | |
| Joan Rosell +1 other reference |
| - (n.d.) | |
USA | |
| RUFF Project: ... |
| Verified at the U. of Arizona +1 other reference |
| In the collection of Brent Thorne. ... |
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Courtland, Turquoise Mining District, Cochise County, Arizona, USA