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Richardsite

This page kindly sponsored by John A. Jaszczak
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About RichardsiteHide

Formula:
Zn2CuGaS4
Colour:
Dark grey
Lustre:
Metallic
Hardness:
3
Specific Gravity:
4.278 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Richardsite is named in honor of Dr. R. Peter Richards in recognition of his extensive research and writing on topics related to understanding the genesis of the morphology of minerals.
Unique combination of (species-defining) elements.


Classification of RichardsiteHide

Approved

Physical Properties of RichardsiteHide

Metallic
Transparency:
Opaque
Colour:
Dark grey
Streak:
black
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.278 g/cm3 (Calculated)

Optical Data of RichardsiteHide

Anisotropism:
violet to light-blue rotation tints
Bireflectance:
moderately bireflectant
Colour in reflected light:
bluish gray in color
Internal Reflections:
None
Pleochroism:
Non-pleochroic

Chemical Properties of RichardsiteHide

Formula:
Zn2CuGaS4

Crystallography of RichardsiteHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2m
Cell Parameters:
a = 5.3626(2) Å, c = 10.5873(5) Å
Ratio:
a:c = 1 : 1.974
Unit Cell V:
304.46 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of RichardsiteHide

General Appearance of Type Material:
small (50–400 μm) dark gray, disphenoidal crystals epitaxically oriented on wurtzite–sphalerite crystals
pseudo-tetrahedral dispenoidal habit
Place of Conservation of Type Material:
Museo di Storia Naturale, Università degli Studi di Firenze, Via La Pira 4, I-50121, Firenze, Italy, catalogue number 3555/I, and the A. E. Seaman Mineral Museum, 1404 E. Sharon Ave., Houghton, Michigan 49931-1659, USA, catalogue number DM 31876.
Associated Minerals at Type Locality:
Reference:
Bindi, L.; Jaszczak, J.A. (2020) Richardsite, Zn2CuGaS4, A New Gallium-Essential Member of the Stannite Group from the Gem Mines near Merelani, Tanzania. Minerals 10, 467.

Synonyms of RichardsiteHide

Relationship of Richardsite to other SpeciesHide

Member of:
Other Members of this group:
BriartiteCu2(Fe,Zn)GeS4Tet.
ČernýiteCu2(Cd,Zn,Fe)SnS4Tet. 4 2m : I4 2m
FamatiniteCu3SbS4Tet. 4 2m : I4 2m
FerrokësteriteCu2FeSnS4Tet. 4 : I4
HocartiteAg2(Fe2+,Zn)SnS4Tet. 4 2m : I4 2m
IdaiteCu5FeS6Hex.
Kësterite Cu2ZnSnS4Tet. 4 : I4
KeutschiteCu2AgAsS4Tet. 4 2m : I4 2m
KuramiteCu3SnS4Tet.
LuzoniteCu3AsS4Tet. 4 2m : I4 2m
OmariniiteCu8Fe2ZnGe2S12Orth. 2 2 2 : I2 2 2
PermingeatiteCu3SbSe4Tet.
Petrukite(Cu,Fe,Zn,Ag)3(Sn,In)S4Orth.
PirquitasiteAg2ZnSnS4Tet. 4 : I4
StanniteCu2FeSnS4Tet. 4 2m : I4 2m
StannoiditeCu+6Cu2+2(Fe2+,Zn)3Sn2S12Orth.
UM1984-30-S:CuFeSnCu2Fe2Sn3S7
Unnamed (Cu-Zn-In Sulphide)CuZn2InS4
VelikiteCu2HgSnS4Tet.
ZincobriartiteCu2(Zn,Fe)(Ge,Ga)S4Tet. 4 2m : I4 2m

Other InformationHide

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 RichardsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L.; Jaszczak, J.A. (2020) Richardsite, Zn2CuGaS4, A New Gallium-Essential Member of the Stannite Group from the Gem Mines near Merelani, Tanzania. Minerals 10, 467.
Bindi, L. and Jaszczak, J.A. (2020) Richardsite, IMA 2019-136. CNMNC Newsletter No. 55; Mineralogical Magazine, 84, https://doi.org/10.1180/mgm.2020.39

Internet Links for RichardsiteHide

Localities for RichardsiteHide

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 locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tanzania (TL)
 
  • Manyara Region
    • Simanjiro District
      • Lelatema Mountains
Bindi, L.; Jaszczak, J.A. (2020) Richardsite, Zn2CuGaS4, A New Gallium-Essential Member of the Stannite Group from the Gem Mines near Merelani, Tanzania. Minerals 10, 467.
 
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