Erdite (original) (raw)
A valid IMA mineral species
About ErditeHide
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Crystal System:
Monoclinic
Name:
Named by G.K. Czamanske, B.F. Leonard, J.R. Clark in 1980 in honor of Richard Clarkson "Dick" Erd (29 February 1924, Lexington, Kentucky, USA - 20 May 2008, Springdale, Arkansas, USA), mineralogist with the US Geological Survey. He had previously synthesized the substance in 1956.
This page provides mineralogical data about Erdite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1394:5
1ca24dc2-0ec0-4812-8eb8-4069a6b066f1
IMA Classification of ErditeHide
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Classification of ErditeHide
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2.FD.20
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
D : With O, OH, H2O
2.14.5.1
2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
3.0.1
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
0 : Sulphides etc. of the alkalis
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Erd | 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 ErditeHide
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Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Sorry, your browser doesn't support HTML5 audio. | Jolyon Ralph | United Kingdom |
Physical Properties of ErditeHide
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Comment:
Tarnishes quickly
Hardness:
VHN15=22 - 67 kg/mm2 - Vickers
Cleavage:
Distinct/Good
{110} Good
Density:
2.30 g/cm3 (Measured) 2.216 g/cm3 (Calculated)
Comment:
Measured contaminated with magnetite
Optical Data of ErditeHide
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Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 10.2% | 23.8% |
| 420nm | 9.8% | 28.8% |
| 440nm | 10.1% | 27.3% |
| 460nm | 10.9% | 20.8% |
| 480nm | 11.3% | 15.6% |
| 500nm | 11.3% | 16.6% |
| 520nm | 11.0% | 23.3% |
| 540nm | 10.6% | 25.7% |
| 560nm | 10.3% | 25.7% |
| 580nm | 10.0% | 31.6% |
| 600nm | 9.8% | 36.6% |
| 620nm | 9.7% | 43.1% |
| 640nm | 9.8% | 46.9% |
| 660nm | 10.0% | 44.3% |
| 680nm | 10.6% | 39.3% |
| 700nm | 11.0% | 35.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 46.9%.
R1 shown in black, R2 shown in red
Comments:
Extreme. Brilliant reddish-orange through greenish grays and pinkish grays to dark gray with barely perceptible bluish or greenish tint.
Chemistry of ErditeHide
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Mindat Formula:
NaFeS2 · 2H2O
Crystallography of ErditeHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.693 Å, b = 9.115 Å, c = 5.507 Å
β = 92.17°
Ratio:
a:b:c = 1.173 : 1 : 0.604
Unit Cell V:
536.36 ų (Calculated from Unit Cell)
Morphology:
Minute fibers, fine bladed crystals to 1 mm long.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000785 | Erdite | Konnert J A, Evans H T (1980) The crystal structure of erdite, NaFeS2*2H2O American Mineralogist 65 516-521 |  |
1980 | Coyote Peak, Humboldt County, California, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.935 Å | (100) |
| 5.342 Å | (71) |
| 4.556 Å | (41) |
| 3.467 Å | (28) |
| 2.310 Å | (23) |
| 2.902 Å | (15) |
| 3.317 Å | (12) |
Comments:
Coyote Peak, California, USA.
Geological EnvironmentHide
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Geological Setting:
Pegmatites in nepheline syenite
Type Occurrence of ErditeHide
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General Appearance of Type Material:
Copper-red granular masses of impure erdite reach dimensions of several millimeters. The largest clean single crystals measure 0.5 x 1 mm.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA.
Geological Setting of Type Material:
In mafic, alkalic diatreme. Very young rock (29 m.y.)
Associated Minerals at Type Locality:
Synonyms of ErditeHide
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Other Language Names for ErditeHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 2.FD. | Ferrovalleriite | 2(Fe,Cu)S · 1.5Fe(OH)2 | Trig. |
|---|---|---|---|
| 2.FD.05 | Kermesite | Sb2S2O | Tric. 1 : _P_1 |
| 2.FD.10 | Viaeneite | (Fe,Pb)4S8O | Mon. |
| 2.FD.25 | Coyoteite | NaFe3S5 · 2H2O | Tric. |
| 2.FD.30 | Haapalaite | (Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22 | Hex. |
| 2.FD.30 | Valleriite | (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6 | Trig. |
| 2.FD.30 | Yushkinite | (Mg,Al)V4+S2(OH)2 | Trig. 3_m_ _(_32/m ) : _P_3_m_1 |
| 2.FD.30 | Ekplexite | (Nb,Mo,W)S2 · (Mg1-xAlx)(OH)2+x | Trig. |
| 2.FD.35 | Tochilinite | Fe2+5-6(Mg,Fe2+)5S6(OH)10 | Mon. |
| 2.FD.35 | Ferrotochilinite | Fe2+6(Fe2+,Mg)5S6(OH)10 | Mon. |
| 2.FD.35 | Kaskasite | (Mo,Nb)S2 · (Mg1-xAlx)(OH)2+x | Trig. |
| 2.FD.35 | Manganokaskasite | (Mo,Nb)S2 · (Mn1-xAlx)(OH)2+x | Trig. |
| 2.FD.40 | Wilhelmramsayite | Cu3FeS3 · 2H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m m |
| 2.FD.45 | Vyalsovite | FeCaAlS(OH)5 | Orth. |
| 2.FD.50 | Bazhenovite | Ca8S2(S3)(S2O3)(OH)12 · 20H2O | Mon. 2/m : _P_21/b |
| 2.FD.55 | UM2004-56-OS:BiCuPb | PbCu4Bi4S2(O,OH,H2O)16 (?) | Tet. |
Other InformationHide
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Thermal Behaviour:
When heated in a closed tube, it gives off water, sulfur and eventually turns black and strongly magnetic.
Notes:
Easily soluble in cold dilute acids with effervescence of H2S.
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 ErditeHide
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References for ErditeHide
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Localities for ErditeHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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.
| Canada | |
|---|---|
| Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH) | Horváth et al. (1990) +1 other reference |
| Lajemmerais RCM Varennes & St-Amable ⓘ Saint-Amable sill | Horváth et al. (1998) |
| ⓘ Demix-Varennes quarry | Horváth et al. (1998) |
| Poland | |
| Silesian Voivodeship Wodzisław County Radlin ⓘ Marcel mine heap ? | Cu +2 other references |
| Russia | |
| Murmansk Oblast Lovozersky District ⓘ Alluaiv Mountain | [World of Stones 95:5-6 |
| USA (TL) | |
| California Humboldt County Coastal Range ⓘ Coyote Peak (TL) | Van Nostrand Reinholt Press: 67 +4 other references |