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Richardsollyite

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R.H. Solly
Formula:
TlPbAsS3
System:
Monoclinic
Colour:
grey-black
Lustre:
Metallic
Name:
The name honors Richard Harrison Solly (4 September 1851, London, England - 5 December 1925, Bournemouth, England), a British autodidact, who carefully described eight new mineral species from Lengenbach between 1901 and 1912. He can be considered the most successful scientist of the first flourishing period of Lengenbach investigations, at the dawn of the twentieth century.
New structure type. Chemically similar to edenharterite, enneasartorite, hendekasartorite, hutchinsonite, and incomsartorite.

The Pb analogue of christite.

The structure has [Pb(AsS3)] layers located as per the (100) planes; the layers sandwich Tl+ cations.

Isostructural with synthetic ABCX3 compounds (A = K, Rb, Cs; B = Eu, Ba; C = As, Sb; X = S, Se).


Classification of Richardsollyite

Approved, Pending publication
Approval Year:
2016

Physical Properties of Richardsollyite

Metallic
Colour:
grey-black

Optical Data of Richardsollyite

Type:
Anisotropic
Anisotropism:
distinct, greyish-white to bluish rotation tints
Reflectivity:
471.1nmR1=27.9%R2=29.8%
548.3nmR1=27.8%R2=31.0%
586.6nmR1=27.3%R2=30.8%
652.3nmR1=27.0%R2=30.5%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 31.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
grey
Internal Reflections:
bright-red

Chemical Properties of Richardsollyite

Formula:
TlPbAsS3
Elements listed in formula:
Analytical Data:
electron microprobe, wt.%; empirical formula basis is 6 atoms
Tl 34.72
Pb 35.45
As 12.80
Sb 0.04
S 16.22

total 99.24

Crystallography of Richardsollyite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 8.8925(2) Å, b = 8.4154(2) Å, c = 8.5754(2) Å
β = 108.665(3)°
Ratio:
a:b:c = 1.057 : 1 : 1.019
Unit Cell Volume:
V 607.98 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.23(80)
3.875(70)
3.762(100)
3.278(70)
2.931(70)
2.714(70)
2.622(80)

Type Occurrence of Richardsollyite

General Appearance of Type Material:
crystals up to 750 μm in diameter
Place of Conservation of Type Material:
Mineralogical collections of the Musée Cantonal de Géologie, UNIL-Anthropole, Dorigny, CH-1015 Lausanne, Switzerland (catalogue number MGL n. 080126)
Empirical Formula:
Tl1.001Pb1.008(As1.007Sb0.002)Σ1.009S2.982
Associated Minerals at Type Locality:

Relationship of Richardsollyite to other Species

Common Associates:

Other Names for Richardsollyite

Name in Other Languages:

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.

References for Richardsollyite

Reference List:
Meisser, N., Roth, P., Nestola, F., Biagioni, C., Bindi, L., Robyr, M. (2016) Richardsollyite, IMA 2016-043. CNMNC Newsletter No. 33, October 2016, page 1138; Mineralogical Magazine: 80: 1135–1144

Meisser, N., Roth, P. (2016) Mining for new minerals: the Lengenbach deposit (Switzerland). Talk given at the conference "New Minerals and Mineralogy in the 21th Century - International scientific symposium Jáchymov 2016", Jáchymov, Czech Republic, September 3-5, 2016. [Photo is given in conference abstract volume, p. 56, labeled as "IMA 2016-043"]

Meisser, N., Roth, P., Nestola, F., Biagioni, C., Bindi, L., Robyr, M. (2017): Richardsollyite, TlPbAsS3, a new sulfosalt from the Lengenbach quarry, Binn Valley, Switzerland. European Journal of Mineralogy: 29 (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=13732 (2017)

Internet Links for Richardsollyite

mindat.org URL:
https://www.mindat.org/min-47993.html
Please feel free to link to this page.

Localities for Richardsollyite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Meisser, N. & Roth, P. (2016): Mining for new minerals: the Lengenbach deposit (Switzerland). Talk given at the conference "New Minerals and Mineralogy in the 21th Century - International scientific symposium Jáchymov 2016", Jáchymov, Czech Republic, September 3-5, 2016; Meisser, N. & Roth, P. (2017): Richardsollyit, eine erstaunliche neue Mineralart. Schweizer Strahler 51 (1), 36-38 (in German and French).
Mineral and/or Locality  
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