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Talmessite

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Formula:
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
System:TriclinicColour:White, colorless, ...
Hardness:5
Member of:Fairfieldite Group
Name:Named after its discovery locality, the Talmessi Mine, Iran.

Classification of Talmessite

IMA status:Approved
Strunz 8th edition ID:7/C.17-50
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:40.2.2.5

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:20.2.18

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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Type Occurrence of Talmessite

Type Locality:Talmessi Mine (Talmesi Mine; Telmessi Mine; Telmesi Mine), Anarak District, Nain County (Nayin County), Esfahan Province (Isfahan Province; Aspadana Province), Iran
Year of Discovery:1960

Physical Properties of Talmessite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:White, colorless, translucent pale green (nickelian), brownish pink (cobaltian)
Hardness (Mohs):5

Crystallography of Talmessite

Crystal System:Triclinic
Cell Parameters:a = 5.87Å, b = 6.94Å, c = 5.53Å
α = 97.3°, β = 108.7°, γ = 108.1°
Ratio:a:b:c = 0.846 : 1 : 0.797
Unit Cell Volume:V 196.29 ų (Calculated from Unit Cell)

Optical Data of Talmessite

Type:Biaxial (-)
RI values: nα = 1.672 nβ = 1.685 nγ = 1.698
2V:Measured: 90° , Calculated: 88°
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v strong

Chemical Properties of Talmessite

Formula:
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
Simplified for copy/paste:Ca2Mg(AsO4)2·2H2O
Essential elements:As, Ca, H, Mg, O
All elements listed in formula:As, Ca, H, Mg, O

Relationship of Talmessite to other Species

Series:Forms a series with Gaitite (see here)
Forms a series with β-Roselite (see here)
Member of:Fairfieldite Group
Other Members of Group:

- +
Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)(PO
 
4
)
 
2
· 2H
 
2
O
Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
· 2H
 
2
O
Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
Unnamed (Fe2+-analogue of Parabrandtite)
Ca
 
2
Fe
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
β-Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CG.05Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Hillite
Ca
 
2
(Zn,Mg)(PO
 
4
)
 
2
· 2 H
 
2
O
8.CG.10Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Wendwilsonite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Rruffite
Ca
 
2
Cu(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.15Ferrilotharmeyerite
Ca(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Mounanaite
PbFe
3+
2
(VO
 
4
)
 
2
· 2(OH,F)
8.CG.15Thometzekite
Pb(Cu,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Cobaltlotharmeyerite
Ca(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Cabalzarite
Ca(Mg,Al,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Krettnichite
(Pb,Sr)(Mn
3+
 
,Co)
 
2
(VO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Cobalttsumcorite
Pb(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Nickellotharmeyerite
Ca(Ni,Fe
3+
 
,Co)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Manganlotharmeyerite
Ca(Mn
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Schneebergite
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Nickelschneebergite
(Bi
3+
 
,Ca)(Ni,Co,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.20Gartrellite
Pb(Cu,Fe
3+
 
,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Helmutwinklerite
Pb(Zn,Cu)
 
2
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.20Zincgartrellite
Pb(Zn,Fe
3+
 
,Cu)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Rappoldite
Pb(Co,Ni,Zn)
 
2
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.20Phosphogartrellite
Pb(Cu,Fe
3+
 
)
 
2
(PO
 
4
,AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Lukrahnite
Ca(Cu,Zn)(Fe
3+
 
,Zn)(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.25Pottsite
HPbBi(VO
 
4
)
 
2
· 2H
 
2
O
8.CG.35Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
· 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.2.1Bearsite
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.3Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.2.5Weilite
Ca(HAsO
 
4
)
20.2.6Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
20.2.7Haidingerite
CaHAsO
 
4
· H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.10Vladimirite
Ca
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
· 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
· 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
· 4H
 
2
O
20.2.16Bergslagite
CaBeAsO
 
4
(OH)
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
· 5H
 
2
O

Other Names for Talmessite

Synonyms:
Arsenate-beloviteBelovite (of Nefedov)
Other Languages:
German:Arsenatbelowit
Talmessit
Russian:Талмессит
Spanish:Talmessita
Varieties:
Cobaltoan TalmessiteNickeloan Talmessite

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Talmessite

Reference List:

- +
American Mineralogist (1957): 42: 583.

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.

Pierrot, R. (1964): Contribution à la minéralogie des arséniates calciques et calcomagnésiens naturels. Bull. Soc. fr. Minéral. Cristallogr. 87, 169-211.

American Mineralogist (1965): 50: 813.

Yakhontova, L.K. (1968): Trudy Mineral. Muzeya Akad. Nauk SSSR: 18: 154-167.

Canadian Mineralogist (1976): 14: 198.

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 la Société française de Minéralogie et de Cristallographie, 100, 230-236.

Weiss, S., Lengauer, C.L., Parodi, G.C. (2002): Roselith, Wendwilsonit und kobalthaltiger Talmessit aus Bou Azzer, Marokko. Lapis 27 (1), 37-41; 58. (in German)

Joswig, W., Paulus, E. F., Liebscher, B. (2004): Crystal structure of dicalcium (cobalt,magnesium) diarsenate dihydrate, Ca2(Co0.532Mg0.468)[AsO4]2•2H2O, hydrogen bonding in talmessite. Z. Kristallogr. - New Cryst. Struct. 219, 341-342. [[Note: The use of the mineral name talmessite in the paper title is erroneous; the sample in fact corresponds to roselite-beta.]

Internet Links for Talmessite

Search Engines:
  • Look for Talmessite on Google
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  • External Links:
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  • Look for Talmessite on Athena Mineralogy
  • Look for Talmessite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Talmessite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Buy fine minerals and gemstones from Pala International
  • Specimens:The following Talmessite specimens are currently listed for sale on minfind.com.

    Localities for Talmessite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Lölling
            • Stelzing
              • Klippitztörl road cuts
    Meixner, H. & Ruscha, S. (1979): Talmessit, ein für Österreich neues Mineral, aus der Umgebung des Klippitztörls, Saualpe, Kärnten. Karinthin 80, 86-88.; G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
    Chile
     
    • Arica and Parinacota Region
      • Arica Province
        • Los Camarones
    Samples analysed by Tony Kampf of LAC Mineralogical Museum, USA
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
    Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Tait, K.T. (2011): Rruffite, Ca2Cu(AsO4)2·2H2O,a new member of the roselite group, from Tierra Amarilla, Chile. Canadian Mineralogist, 49, 877-884
      • Huasco Province
        • Freirina
          • Sierra Perdices
    Samples analysed by Dr. Jochen Schluter (Hamburg University), Germany; http://www.lrz-muenchen.de/~mineralogische-sammlungen-dmg/analysen/talmessit.htm
    • Tarapacá Region
      • El Tamarugal Province
        • Salar Grande
    samples analysed by Anthony Kampf, Curator Emeritus of Mineral Sciences at NHM of LAC, California
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov District (St Joachimsthal)
    Lapis 2002(7/8), 63-65
    France
     
    • Alsace
      • Haut-Rhin
    Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997
    • Provence-Alpes-Côte d'Azur
      • Alpes-Maritimes
    Feraud, J., Pillard, F. & Vernet, J. (1976): Talmessite, Ca2Mg(AsO4)2.2H2O, in the baritic karst of pre-albian age of Luceram (Maritime Alps, France). Bulletin de la Société française de Minéralogie et de Cristallographie 99, 331-333 (in French).; Cuchet S. (2000), Mystérieuse irhtémite à Lucéram, Alpes-Maritimes, Le Règne Minéral, n°36, pp: 38-42
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schenkenzell
    Walenta, K. (2001): Neue Mineralfunde aus dem Schwarzwald. 8. Folge, 1. Teil. Lapis, 26 (2), 39-42.
    • Hesse
      • Richelsdorf District
        • Bauhaus
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Süss
          • Richelsdorf Smelter
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
    • Saxony
      • Erzgebirge
    Lapis 30(7/8):78-80 (2005)
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Plaka
            • Plaka Mines
    Wendel, W., Blaß, G., Mühlbauer, W. & Markl, G. (1999): Hilarion - Plaka - Sounion: Lavrion-News 1997-1999. Lapis, 24 (7-8), 64-67; Branko Rieck and Karl-Heinz Fabritz information
    Hungary
     
    • Baranya Co.
      • Mecsek Mtns
    Szakáll & Jánosi: minerals of hungary, 1995
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Iran
     
    • Esfahan Province (Isfahan Province; Aspadana Province)
      • Nain County (Nayin County)
        • Anarak District
    [Bull.Soc.fr.Min.Crist.(1960) 83, 118-121; Clark, 1993 - "Hey's Mineral Index", p684]
    Italy
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
            • Reppia
    Balestra, C., Armellino, G., Kolitsch, U., & Bracco, R. (2006). Talmessite di Gambatesa. MICRO (UK report), 2006, 25-26.
    • Piedmont
      • Cuneo Province
        • Corsaglia Valley
          • Montaldo di Mondovì
            • Borgata Oberti
              • Frazze and Rocconi localities
    Kolitsch, U., Ciriotti, M.E., Cadoni, M., Armellino, G., Piccoli, G.C., Ambrino, P., Blass, G., Odicino, G., Ciuffardi, M. (2011): Montaldo di Mondovì Minerali della miniera di manganese e ferro. Micro, 9, 4-21.
    Japan
     
    • Kyushu Region
      • Oita prefecture
        • Saeki city
          • Kiura mine (Shin-Kiura mine; Kiura emery mine)
    Masayuki OHNISHI, Norimasa SHIMOBAYASHI, Shigetomo KISHI, Mitsuo TANABE, Shoichi KOBAYASHI (2013) Talmessite from the Uriya deposit at the Kiura mining area, Oita Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 108, No. 2 (April), 116-120.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azer District (Bou Azzer District)
            • Aghbar
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    [var: Cobaltoan Talmessite] Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Agoudal
    Analyses for Jordi Frabre
    Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
    [var: Nickeloan Talmessite] Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    [var: Nickeloan Talmessite] Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68. (in German)
    [var: Nickeloan Talmessite] Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Bou Azer
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2001). Bou Azzer, description des espèces minérales. Le Cahier des Micromonteurs, (73), 34-112. (in French)
    N. Meisser, J. Brugger (2006): "Bouazzerit und Maghrebit, zwei neue Arsenatmineralien aus dem Revier Bou Azzer, Marokko", Lapis 31(7/8), 69-71
            • Ightem
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Méchoui
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Oumlil
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Tamdrost
    Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Namibia
     
    • Otjikoto Region (Oshikoto)
      • Tsumeb
    analysed - EDS & SXRD; Franz Neuhold, Vienna
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
    UK
     
    • England
      • Devon
        • Okehampton area (Northern Dartmoor)
          • Belstone
    Braithwaite, R.S.W., et al., Journal of the Russell Society 6(2), 100-101(1996).
    USA
     
    • Arizona
      • Mohave Co.
        • Hualapai Indian Reservation
    The Canadian Mineralogist; October 2007; v. 45; no. 5; p. 1177-1188
        • Peach Springs Canyon
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 253, 389; Wenrich, K.J. & H.B. Sutphin (1988), Recognition of breccia pipes in northern Arizona, AZ Bur. Geol. Min. Tech. Fieldnotes: 18:1-5, 11.
    • Utah
      • Tooele Co.
        • Deep Creek Mts
          • Gold Hill District (Clifton District)
            • Gold Hill
    Kokinos, M. and Wise, W.S. (1993), Famous Mineral Localities: the Gold Hill mine, Tooele County, Utah. Mineralogical Record: 24(1): 11-22.
    Kokinos, M. and Wise, W.S. (1993), Famous Mineral Localities: the Gold Hill mine, Tooele County, Utah. Mineralogical Record: 24(1): 11-22.
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    Updated Mineral Entry: AmesiteFrom Uwe Kolitsch, 1st Sep 2014 18:19:05