Tocornalite
A valid IMA mineral species - grandfathered - questionable
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About Tocornalite
Manuel A. Tocornal
Formula:
(Ag,Hg)I
Colour:
Light yellow, darkening upon exposure
Lustre:
Vitreous, Sub-Vitreous, Waxy
Crystal System:
Hexagonal
Name:
Named in honor of Manuel Antonio Tocornal (12 June 1817, Santiago, Chile - 15 August 1867, Santiago, Chile), lawyer, historian, politician, and briefly the rector of the Universidad de Chile of Santiago (1866-1867).
Translucent yellow streaks and masses, general 1-2mm. May be darkened significantly due to prolonged exposure to light.
Unique Identifiers
Mindat ID:
3987
Long-form identifier:
mindat:1:1:3987:7
GUID
(UUID V4):
(UUID V4):
0f151540-3ab2-4723-8b90-a445502b5ac1
IMA Classification of Tocornalite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
(Ag,Hg)I (?)
Classification of Tocornalite
3.AA.10
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.6.1
9 : NORMAL HALIDES
1 : AX
9 : NORMAL HALIDES
1 : AX
8.5.11
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
5 : Halides of Zn and Hg
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
5 : Halides of Zn and Hg
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 |
|---|---|---|
| Toc | 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 Tocornalite
Vitreous, Sub-Vitreous, Waxy
Transparency:
Transparent, Translucent
Colour:
Light yellow, darkening upon exposure
Streak:
Yellow
Tenacity:
Waxy
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Chemistry of Tocornalite
Mindat Formula:
(Ag,Hg)I
Elements listed:
Crystallography of Tocornalite
Crystal System:
Hexagonal
Morphology:
Massive.
Comment:
Crystal Data: n.d. Point Group: n.d.; Cell Data: Space Group: n.d. Z = n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.37 Å | (70) |
| 4.67 Å | (20) |
| 4.51 Å | (20) |
| 3.76 Å | (90) |
| 3.61 Å | (90) |
| 3.39 Å | (10) |
| 3.29 Å | (40) |
| 3.19 Å | (40) |
| 2.998 Å | (30) |
| 2.894 Å | (40) |
| 2.644 Å | (100) |
| 2.468 Å | (10) |
| 2.309 Å | (20) |
| 2.254 Å | (70) |
| 2.127 Å | (30) |
| 2.036 Å | (50) |
| 1.877 Å | (40) |
| 1.834 Å | (20) |
| 1.743 Å | (20) |
| 1.695 Å | (30) |
| 1.634 Å | (40) |
| 1.583 Å | (30) |
Comments:
ICDD 25-1326
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]) |
Other Language Names for Tocornalite
German:Tocornalit
Spanish:Tocornalita
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Tocornalite associated with Marshite | CuI |
| 1 photo of Tocornalite associated with Chlorargyrite | AgCl |
| 1 photo of Tocornalite associated with Cerussite | PbCO3 |
| 1 photo of Tocornalite associated with Halloysite | Al2(Si2O5)(OH)4 |
Related Minerals - Strunz-mindat Grouping
| 3.AA. | Brontesite | (NH4)3PbCl5 |
| 3.AA.05 | Marshite | CuI |
| 3.AA.05 | Miersite | (Ag,Cu)I |
| 3.AA.05 | Nantokite | CuCl |
| 3.AA.05 | UM1999-11:I:CuS | Cu(I,S) |
| 3.AA.10 | Iodargyrite | AgI |
| 3.AA.15 | Bromargyrite | AgBr |
| 3.AA.15 | Chlorargyrite | AgCl |
| 3.AA.20 | Carobbiite | KF |
| 3.AA.20 | Griceite | LiF |
| 3.AA.20 | Halite | NaCl |
| 3.AA.20 | Sylvite | KCl |
| 3.AA.20 | Villiaumite | NaF |
| 3.AA.25 | Salammoniac | NH4Cl |
| 3.AA.25 | UM1998-03-Cl:Tl | TlCl |
| 3.AA.25 | Lafossaite | Tl(Cl,Br) |
| 3.AA.25 | Nataliyamalikite | TlI |
| 3.AA.30 | Calomel | [Hg2]2+Cl2 |
| 3.AA.30 | Kuzminite | [Hg2]2+(Br,Cl)2 |
| 3.AA.30 | Moschelite | [Hg2]2+I2 |
| 3.AA.35 | Neighborite | NaMgF3 |
| 3.AA.35 | Parascandolaite | KMgF3 |
| 3.AA.40 | Chlorocalcite | KCaCl3 |
| 3.AA.40 | Javorieite | KFeCl3 |
| 3.AA.45 | Kolarite | PbTeCl2 |
| 3.AA.50 | Radhakrishnaite | PbTe3(Cl,S)2 |
| 3.AA.55 | Challacolloite | KPb2Cl5 |
| 3.AA.60 | Hephaistosite | TlPb2Cl5 |
| 3.AA.90 | Pseudocotunnite | K2PbCl4 |
Fluorescence of Tocornalite
Not fluorescent in shortwave
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 Tocornalite
mindat.org URL:
https://www.mindat.org/min-3987.html
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References for Tocornalite
Reference List:
Localities for Tocornalite
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.
Australia | |
| Birch et al. (1997) |
Chile | |
| Cook (1979) |
USA | |
| Bancroft (1990) +1 other reference |
| Castor et al. (2004) |
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Kintore opencut, Broken Hill South Mine, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia