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Edtollite
A valid IMA mineral species
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About Edtollite
Eduard Toll
Formula:
K2NaCu5Fe3+O2(AsO4)4
Colour:
Brown–black to black
Lustre:
Sub-Metallic
Specific Gravity:
4.26 (Calculated)
Crystal System:
Triclinic
Name:
Named in honor of Eduard Gustav Freiherr von Toll (in Russian, Eduard Vasilievich Toll) (March 1858, Reval, Russian Empire (now Estonia) – 1902, East Siberian Sea), geologist and Arctic explorer.
New structure type. Unique combination of elements. Compare melanarsite, pansnerite and achyrophanite.
The Fe(III) analogue of alumoedtollite.
The Fe(III) analogue of alumoedtollite.
Unique Identifiers
Mindat ID:
47796
Long-form identifier:
mindat:1:1:47796:1
IMA Classification of Edtollite
Approved
IMA Formula:
K2NaCu2+5Fe3+O2(As5+O4)4
Approval year:
2016
First published:
2019
Type description reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Ksenofontov, Dmitry A., Pautov, Leonid A., Sidorov, Evgeny G., Britvin, Sergey N., Vigasina, Marina F., Pushcharovsky, Dmitry Y. (2019) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. X. Edtollite, K2NaCu5Fe3+O2(AsO4)4, and alumoedtollite, K2NaCu5AlO2(AsO4)4. Mineralogical Magazine, 83 (4) 485-495 doi:10.1180/mgm.2018.155
Classification of Edtollite
8.AC.
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
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 for Standard |
|---|---|---|
| Edt | 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 Edtollite
Optical Data of Edtollite
Anisotropism:
Distinct
Bireflectance:
Very weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 7.0% | 6.8% |
| 420nm | 7.1% | 7.2% |
| 440nm | 7.8% | 7.8% |
| 460nm | 8.1% | 8.2% |
| 470nm | 8.3% | 8.2% |
| 480nm | 8.4% | 8.2% |
| 500nm | 8.2% | 7.9% |
| 520nm | 8.0% | 7.7% |
| 540nm | 7.8% | 7.5% |
| 546nm | 7.7% | 7.4% |
| 560nm | 7.6% | 7.3% |
| 580nm | 7.2% | 7.0% |
| 589nm | 7.1% | 6.9% |
| 600nm | 6.9% | 6.8% |
| 620nm | 6.6% | 6.5% |
| 640nm | 6.4% | 6.3% |
| 650nm | 6.3% | 6.3% |
| 660nm | 6.3% | 6.2% |
| 680nm | 6.2% | 6.2% |
| 700nm | 6.3% | 6.4% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 8.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Grey
Internal Reflections:
Weak, brown
Pleochroism:
Not Visible
Chemistry of Edtollite
Mindat Formula:
K2NaCu5Fe3+O2(AsO4)4
Element Weights:
Crystallography of Edtollite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.1168(6) Å, b = 9.124(1) Å, c = 9.698(1) Å
α = 110.12(1)°, β = 102.45(1)°, γ = 92.85(1)°
α = 110.12(1)°, β = 102.45(1)°, γ = 92.85(1)°
Ratio:
a:b:c = 0.561 : 1 : 1.063
Unit Cell V:
411.32 ų
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.79 Å | (92) |
| 7.63 Å | (41) |
| 5.22 Å | (44) |
| 3.427 Å | (100) |
| 3.148 Å | (64) |
| 2.851 Å | (65) |
| 2.569 Å | (77) |
| 2.551 Å | (40) |
Reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Ksenofontov, Dmitry A., Pautov, Leonid A., Sidorov, Evgeny G., Britvin, Sergey N., Vigasina, Marina F., Pushcharovsky, Dmitry Y. (2019) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. X. Edtollite, K2NaCu5Fe3+O2(AsO4)4, and alumoedtollite, K2NaCu5AlO2(AsO4)4. Mineralogical Magazine, 83 (4) 485-495 doi:10.1180/mgm.2018.155
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] |
Type Occurrence of Edtollite
General Appearance of Type Material:
Prismatic crystals up to 0.02 mm × 0.1 mm.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4851/1.
Geological Setting of Type Material:
Fumarole.
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Ksenofontov, Dmitry A., Pautov, Leonid A., Sidorov, Evgeny G., Britvin, Sergey N., Vigasina, Marina F., Pushcharovsky, Dmitry Y. (2019) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. X. Edtollite, K2NaCu5Fe3+O2(AsO4)4, and alumoedtollite, K2NaCu5AlO2(AsO4)4. Mineralogical Magazine, 83 (4) 485-495 doi:10.1180/mgm.2018.155
Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia