Nantokite (original) (raw)
Colour:
Colourless, white to greyish, greenish
Specific Gravity:
3.93 - 4.3
Name:
For the locality at Nantoko, Copiapó, Chile.
A rare anhydrous copper chloride, known only from arid environments and slags (as tetrahedral crystals). Colourless and transparent when fresh. Alters superficially to paratacamite (or rather clinoatacamite?) when exposed to air.
Long-form identifier:
mindat:1:1:2840:6
917e4cad-8ddb-49d2-b606-48cfebfa8736
Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
3.AA.05
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.7.1
9 : NORMAL HALIDES
1 : AX
8.2.1
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
2 : Halides of Cu
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ntk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Colour:
Colourless, white to greyish, greenish
Cleavage:
Distinct/Good
On {011}.
Density:
3.93 - 4.3 g/cm3 (Measured) 4.22 g/cm3 (Calculated)
Class (H-M):
43_m_ - Hextetrahedral
Cell Parameters:
a = 5.407 Å
Unit Cell V:
158.08 ų (Calculated from Unit Cell)
Morphology:
Massive, granular; small white tetrahedra.
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011520 | Nantokite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-237 | 1963 | 0 | 293 | ||
| 0017906 | Nantokite | Wyckoff R, Posnjak E (1922) The Crystal Structures of the Cuprous Halides _cod_database_code 1010991 Journal of the American Chemical Society 44 30-36 | 1922 | 0 | 293 | ||
| 0015185 | Nantokite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015186 | Nantokite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015187 | Nantokite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015188 | Nantokite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 |
CIF Raw Data - click here to close
Place of Conservation of Type Material:
Mining Academy, Freiberg, Germany, 12012.
Reference:
Breithaupt, J.F.A. (1868) Nantokit, ein neues Mineral. Berg- und Hüttenmännische Zeitung: 27: 3-3.
Other Members of this group:
Associated Minerals Based on Photo Data:
Special Storage/
Display Requirements:
Unstable in humid air, and transforms slowly into greenish secondary Cu-hydroxchlorides. Alters to "paratacamite" on exposure.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
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.
- 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.