Emmonsite
A valid IMA mineral species - grandfathered
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About Emmonsite
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
GUID
(UUID V4):
(UUID V4):
0daaf671-7237-41f1-a331-3994fd662ce4
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
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:
Very High
Dispersion:
relatively strong r > v
Pleochroism:
Weak
Chemistry of Emmonsite
Mindat Formula:
Fe3+2(TeO3)3 · 2H2O
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:
Reference:
Hillebrand, W.F. (1885) Emmonsite, a ferric tellurite. Proceedings of the Colorado Scientific Society: 2: 20-23.
Synonyms of Emmonsite
Other Language Names for Emmonsite
Common Associates
Associated Minerals Based on Photo Data:
22 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 Sonoraite | Fe3+(TeO3)(OH) · H2O |
8 photos of Emmonsite associated with Moctezumite | Pb(UO2)(TeO3)2 |
7 photos of Emmonsite associated with Tellurium | Te |
5 photos of Emmonsite associated with Gold | Au |
4 photos of Emmonsite associated with Cuzticite | Fe3+2(TeO6) · 3H2O |
4 photos of Emmonsite associated with Bromargyrite | AgBr |
4 photos of Emmonsite associated with Goethite | α-Fe3+O(OH) |
Related Minerals - Strunz-mindat Grouping
4.JM. | Rudolfhermannite | Fe(Te4+O3)3 · H2O |
4.JM. | Wortupaite | MgNi2+2(Te4+O3)3 · 3H2O |
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 | Zemannite | Mg0.5ZnFe3+(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 | Teineite | Cu2+(Te4+O3) · 2H2O |
4.JM.20 | Telluromandarinoite | Fe3+2Te3O9 · 6H2O |
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 Vol. 679. US Geological Survey doi:10.3133/b679 p.71
Localities for Emmonsite
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.
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Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico