Gortdrumite
A valid IMA mineral species
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About Gortdrumite
Formula:
Cu24Fe2Hg9S23
Originally assumed to be Cu18FeHg6S16.
Colour:
Blackish lead-gray
Lustre:
Metallic
Hardness:
3½ - 4
Specific Gravity:
6.80 (Calculated)
Crystal System:
Triclinic
Name:
Named for the type locality of Gortdrum mine, Ireland.
Type Locality:
This page provides mineralogical data about Gortdrumite.
Unique Identifiers
Mindat ID:
1730
Long-form identifier:
mindat:1:1:1730:1
GUID
(UUID V4):
(UUID V4):
079e1623-5ad8-4ef4-8c4d-ef6986b04331
IMA Classification of Gortdrumite
Approved
Classification of Gortdrumite
2.BD.10
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
D : With Hg, Tl
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
D : With Hg, Tl
2.16.14.1
2 : SULFIDES
16 : Miscellaneous
2 : SULFIDES
16 : Miscellaneous
3.5.9
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
5 : Sulphides etc. of Hg and Tl
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
5 : Sulphides etc. of Hg and Tl
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 |
---|---|---|
Gdr | 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 Gortdrumite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Gortdrumite
Metallic
Transparency:
Opaque
Colour:
Blackish lead-gray
Hardness:
3½ - 4 on Mohs scale
Hardness:
VHN10=186 - 230 kg/mm2 - Vickers
Density:
6.80 g/cm3 (Calculated)
Optical Data of Gortdrumite
Anisotropism:
Strong - colors from gratish white with bluish tint to blue
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 28.0% | 31.4% |
420nm | 28.1% | 31.4% |
440nm | 28.0% | 31.3% |
460nm | 27.8% | 31.2% |
480nm | 27.6% | 31.1% |
500nm | 27.4% | 31.1% |
520nm | 27.0% | 30.8% |
540nm | 26.7% | 30.5% |
560nm | 26.2% | 30.0% |
580nm | 25.9% | 29.5% |
600nm | 25.6% | 29.0% |
620nm | 25.4% | 28.6% |
640nm | 25.3% | 28.4% |
660nm | 25.3% | 28.2% |
680nm | 25.3% | 28.1% |
700nm | 25.2% | 28.0% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 31.4%.
R1 shown in black, R2 shown in red
Chemistry of Gortdrumite
Mindat Formula:
Cu24Fe2Hg9S23
Originally assumed to be Cu18FeHg6S16.
Originally assumed to be Cu18FeHg6S16.
Elements listed:
Crystallography of Gortdrumite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.677(4) Å, b = 9.865(5) Å, c = 11.992(5) Å
α = 77.85(3)°, β = 79.42(4)°, γ = 76.30(8)°
α = 77.85(3)°, β = 79.42(4)°, γ = 76.30(8)°
Ratio:
a:b:c = 0.981 : 1 : 1.216
Unit Cell V:
1076.5 ų
Z:
1
Morphology:
Anhedral grains to 200 microns.
Twinning:
Fine lamellar
Comment:
Originally assumed to be orthorhombic, with a = 14.96, b = 7.90, c = 24.1 Å.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.58 Å | (100) |
3.38 Å | (70) |
2.88 Å | (50) |
2.78 Å | (50) |
6.03 Å | (40) |
3.08 Å | (30) |
3.02 Å | (30) |
2.71 Å | (25) |
Comments:
Gortdrum deposit, Ireland. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Gortdrumite
General Appearance of Type Material:
As anhedral grains, to 200 x 50 µm. Sometimes intergrown with bornite.
Place of Conservation of Type Material:
The Natural History Museum, London, England, number 1983,62.
Geological Setting of Type Material:
Sulfide veins cutting dolomites.
Associated Minerals at Type Locality:
Synonyms of Gortdrumite
Other Language Names for Gortdrumite
German:Gortdrumit
Spanish:Gortdrumita
Common Associates
Associated Minerals Based on Photo Data:
17 photos of Gortdrumite associated with Cinnabar | HgS |
7 photos of Gortdrumite associated with Mercury-bearing Tennantite | Cu6[Cu4(Zn,Fe,Hg)2]As4S13 |
3 photos of Gortdrumite associated with Dolomite | CaMg(CO3)2 |
3 photos of Gortdrumite associated with Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S |
3 photos of Gortdrumite associated with Malachite | Cu2(CO3)(OH)2 |
2 photos of Gortdrumite associated with Schuetteite | Hg2+3(SO4)O2 |
1 photo of Gortdrumite associated with Calcite | CaCO3 |
1 photo of Gortdrumite associated with Quartz | SiO2 |
1 photo of Gortdrumite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
2.BD. | UM2004-33-S:AgCuHgSe | (Ag,Cu)8Hg3(S,Se)7 |
2.BD. | Vrančiceite | Cu10Hg3S8 |
2.BD.05 | Imiterite | Ag2HgS2 |
2.BD.15 | Balkanite | Cu9Ag5HgS8 |
2.BD.15 | Danielsite | (Cu,Ag)14HgS8 |
2.BD.20 | Donharrisite | Ni3HgS3 |
2.BD.25 | Carlinite | Tl2S |
2.BD.30 | Bukovite | (Cu3Fe)Σ4Tl2Se4 |
2.BD.30 | Murunskite | K2(Cu,Fe)4S4 |
2.BD.30 | Thalcusite | Tl2Cu3FeS4 |
2.BD.35 | Rohaite | (Tl,Pb,K)2Cu8.7Sb2S4 |
2.BD.40 | Chalcothallite | Tl2(Cu,Fe)6SbS4 |
2.BD.45 | Sabatierite | TlCu6Se4 |
2.BD.50 | Crookesite | Cu7(Tl, Ag)Se4 |
2.BD.55 | Brodtkorbite | Cu2HgSe2 |
Other Information
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 Gortdrumite
mindat.org URL:
https://www.mindat.org/min-1730.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 Gortdrumite
Reference List:
Localities for Gortdrumite
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.
Austria | |
| Leblhuber (2000) +1 other reference |
Germany | |
| Frank Keutsch analysis (WDS) |
Ireland (TL) | |
| Mineralogical Magazine (1983) +1 other reference |
Spain | |
| Sainz de Baranda Graf et al. (2019) |
USA | |
| Castor et al. (2004) |
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Neuschurf adit, Schwarzleo mining district, Schwarzleograben, Hütten, Leogang, Zell am See District, Salzburg, Austria