Talmessite (original) (raw)
A valid IMA mineral species
About TalmessiteHide
This section is currently hidden. Click the show button to view.
Formula:
Ca2Mg(AsO4)2 · 2H2O
Colour:
White, colorless, translucent pale green (nickel-bearing), brownish pink (cobalt-bearing)
Name:
Named after its discovery locality, the Talmessi Mine, Iran.
Unique IdentifiersHide
This section is currently hidden. Click the show button to view.
Long-form identifier:
mindat:1:1:3876:4
89a37bf7-d319-4b7e-97c2-4f013e5fd096
IMA Classification of TalmessiteHide
This section is currently hidden. Click the show button to view.
Type description reference:
Classification of TalmessiteHide
This section is currently hidden. Click the show button to view.
8.CG.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.2.5
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.2.18
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
Mineral SymbolsHide
This section is currently hidden. Click the show button to view.
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Tlm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Tlm | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Pronunciation of TalmessiteHide
This section is currently hidden. Click the show button to view.
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Sorry, your browser doesn't support HTML5 audio. | Jolyon Ralph | United Kingdom |
Physical Properties of TalmessiteHide
This section is currently hidden. Click the show button to view.
Colour:
White, colorless, translucent pale green (nickel-bearing), brownish pink (cobalt-bearing)
Density:
3.421 g/cm3 (Measured) 3.53 g/cm3 (Calculated)
Optical Data of TalmessiteHide
This section is currently hidden. Click the show button to view.
RI values:
_n_α = 1.672 _n_β = 1.685 _n_γ = 1.698
2V:
Measured: 90° , Calculated: 88°
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of TalmessiteHide
This section is currently hidden. Click the show button to view.
Mindat Formula:
Ca2Mg(AsO4)2 · 2H2O
Crystallography of TalmessiteHide
This section is currently hidden. Click the show button to view.
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 5.874(7) Å, b = 6.943(11) Å, c = 5.537(6) Å
α = 97.3(1)°, β = 108.7(1)°, γ = 108.1(2)°
Ratio:
a:b:c = 0.846 : 1 : 0.797
Unit Cell V:
196.76 ų (Calculated from Unit Cell)
Crystal StructureHide
This section is currently hidden. Click the show button to view.
Load
Unit Cell |Unit Cell Packed
2x2x2 |3x3x3 |4x4x4
Show
Big Balls |Small Balls |Just Balls |Spacefill
Polyhedra Off |Si Polyhedra |All Polyhedra
Remove metal-metal sticks
Display Options
Black Background |White Background
Perspective On |Perspective Off
2D |Stereo |Red-Blue |Red-Cyan
View
CIF File Best |x |y |z |a |b |c
Rotation
Stop |Start
Labels
Console Off |On |Grey |Yellow
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012065 | Talmessite | Catti M, Ferraris G, Ivaldi G (1977) Hydrogen bonding in the crystalline state. Structure of talmessite, Ca2(Mg,Co)(AsO4)2*2H2O, and crystal chemistry of related minerals Bulletin de Mineralogie 100 230-236 | 1977 | Bou-Azzer, Morocco | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
This section is currently hidden. Click the show button to view.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.09 Å | (60) |
| 4.62 Å | (40) |
| 3.56 Å | (60) |
| 3.21 Å | (80) |
| 3.07 Å | (100) |
| 2.77 Å | (100) |
| 1.717 Å | (60) |
Comments:
Talmessi mine, Iran. Nearly identical to pattern of anorthoroselite.
Geological EnvironmentHide
This section is currently hidden. Click the show button to view.
Type Occurrence of TalmessiteHide
This section is currently hidden. Click the show button to view.
General Appearance of Type Material:
Pale green crystals, less than 0.1 mm.
Place of Conservation of Type Material:
National School of Mines, Paris, France; The Natural History Museum, London, England.
Geological Setting of Type Material:
Oxidation zone of a Cu-Ni-Co deposit.
Associated Minerals at Type Locality:
Reference:
Bariand, P. & Herpin, P. (1960): Un arséniate de calcium et de magnésium, isomorphe de la β rosélite. Bulletin de la Société française de Minéralogie et de Cristallographie: 83: 118-121.
Synonyms of TalmessiteHide
This section is currently hidden. Click the show button to view.
Other Language Names for TalmessiteHide
This section is currently hidden. Click the show button to view.
Varieties of TalmessiteHide
This section is currently hidden. Click the show button to view.
Relationship of Talmessite to other SpeciesHide
This section is currently hidden. Click the show button to view.
Other Members of this group:
Common AssociatesHide
This section is currently hidden. Click the show button to view.
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
This section is currently hidden. Click the show button to view.
Other InformationHide
This section is currently hidden. Click the show button to view.
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 TalmessiteHide
This section is currently hidden. Click the show button to view.
References for TalmessiteHide
This section is currently hidden. Click the show button to view.
Reference List:
Localities for TalmessiteHide
This section is currently hidden. Click the show button to view.
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.
Locality ListHide
This section is currently hidden. Click the show button to view.
- 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.