Emmonsite
A valid IMA mineral species - grandfathered
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About Emmonsite
Samuel Franklin Emmons
Formula:
Fe3+2(TeO3)3 · 2H2O
Colour:
Yellowish-green; light yellow-green in transmitted light.
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
4.52 - 4.55
Crystal System:
Triclinic
Name:
For American economic geologist, Samuel Franklin Emmons (1841-1911), U.S. Geological Survey.
This page provides mineralogical data about Emmonsite.
Unique Identifiers
Mindat ID:
1377
Long-form identifier:
mindat:1:1:1377:8
IMA Classification of Emmonsite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+2(Te4+O3)3 · 2H2O
First published:
1885
Classification of Emmonsite
4.JM.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
34.3.3.1
34 : SELENITES, TELLURITES AND SULFITES
3 : A2(XO3)3·xH2O
34 : SELENITES, TELLURITES AND SULFITES
3 : A2(XO3)3·xH2O
28.3.21
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
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 |
|---|---|---|
| Ems | 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 Emmonsite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Emmonsite
Vitreous
Transparency:
Translucent
Colour:
Yellowish-green; light yellow-green in transmitted light.
Hardness:
5 on Mohs scale
Cleavage:
Perfect
On {010}, perfect plus 2 unequal cleavages inclined relative to it, making plane angles of 85° and 95° in {010}.
On {010}, perfect plus 2 unequal cleavages inclined relative to it, making plane angles of 85° and 95° in {010}.
Density:
4.52 - 4.55 g/cm3 (Measured) 4.719 g/cm3 (Calculated)
Optical Data of Emmonsite
Type:
Biaxial (-)
RI values:
nα = 1.962 nβ = 2.090 nγ = 2.100 - 2.120
2V:
Measured: 23° , Calculated: 28° to 48°
Max. Birefringence:
δ = 0.138 - 0.158
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
relatively strong r > v
Pleochroism:
Weak
Chemistry of Emmonsite
Mindat Formula:
Fe3+2(TeO3)3 · 2H2O
Element Weights:
Elements listed:
Crystallography of Emmonsite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.90(1) Å, b = 8.00(1) Å, c = 7.62(1) Å
α = 96.73°, β = 95°, γ = 84.47°
α = 96.73°, β = 95°, γ = 84.47°
Ratio:
a:b:c = 0.988 : 1 : 0.953
Unit Cell V:
474.64 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Radially-configured or lichen-like groups of rough, acicular crystals; druses of thin scales; compact microcrystalline masses. Fibrous crusts with a small botryoidal surface to isolated globular aggregates.
Twinning:
Observed in microscopic crystals (Goldfield, Nevada).
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0015641 | Emmonsite | Pertlik F (1972) Der strukturtyp von emmonsit, {Fe2[TeO3]3*H2O}*xH2O (x=0-1) Tschermaks Mineralogische und Petrographische Mitteilungen 18 157-168 | 1972 | Tombstone, Arizona, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.14 Å | (100) |
| 2.87 Å | (90) |
| 2.52 Å | (90) |
| 3.69 Å | (80) |
| 2.67 Å | (80) |
| 1.80 Å | (80) |
| 5.81 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Geological Setting:
Oxidized zones of tellurium-bearing ore bodies.
Type Occurrence of Emmonsite
Place of Conservation of Type Material:
Yale University, New Haven, Connecticut, USA, 5.6300.
Harvard University, Cambridge, Massachusetts, USA, 97503.
Harvard University, Cambridge, Massachusetts, USA, 97503.
Associated Minerals at Type Locality:
Synonyms of Emmonsite
Other Language Names for Emmonsite
Common Associates
Associated Minerals Based on Photo Data:
| 24 photos of Emmonsite associated with Schmitterite | (UO2)(TeO3) |
| 15 photos of Emmonsite associated with Quartz | SiO2 |
| 9 photos of Emmonsite associated with Mackayite | Fe3+(Te4+2O5)(OH) |
| 8 photos of Emmonsite associated with Moctezumite | Pb(UO2)(TeO3)2 |
| 8 photos of Emmonsite associated with Sonoraite | Fe3+(TeO3)(OH) · H2O |
| 7 photos of Emmonsite associated with Native Tellurium | Te |
| 5 photos of Emmonsite associated with Goethite | Fe3+O(OH) |
| 5 photos of Emmonsite associated with Native Gold | Au |
| 4 photos of Emmonsite associated with Cuzticite | Fe3+2(TeO6) · 3H2O |
| 4 photos of Emmonsite associated with Bromargyrite | AgBr |
Related Minerals - Strunz-mindat Grouping
| 4.JM. | Wortupaite | MgNi2+2(Te4+O3)3 · 3H2O |
| 4.JM. | Rudolfhermannite | Fe2(Te4+O3)3 · H2O |
| 4.JM.05 | Zemannite | Mg0.5ZnFe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Kinichilite | Mg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Ilirneyite | Mg0.5ZnMn3+(Te4+O3)3 · 4.5H2O |
| 4.JM.10 | Blakeite | Fe3+2[TeO3]3 (?) |
| 4.JM.15 | Graemite | Cu[TeO3] · H2O |
| 4.JM.20 | Telluromandarinoite | Fe3+2Te3O9 · 6H2O |
| 4.JM.20 | Teineite | Cu2+(Te4+O3) · 2H2O |
| 4.JM.25 | Millsite | Cu2+(Te4+O3) · 2H2O |
Other Information
Notes:
Readily soluble in strong acids.
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 Emmonsite
mindat.org URL:
https://www.mindat.org/min-1377.html
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References for Emmonsite
Reference List:
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin 679. US Geological Survey doi:10.3133/b679 p.71
Frondel, Clifford, Pough, Fred H. (1944) Two new tellurites of iron: mackayite and blakeite. With new data on emmonsite and "durdenite.". American Mineralogist, 29 (5-6) 211-225
Localities for Emmonsite
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.
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Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico