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Spryite

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About SpryiteHide

Paul Spry
Formula:
Ag8(As3+0.5As5+0.5)S6
Colour:
Black
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
6.334 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Paul Spry (b. 1955, Hobart, Tasmania, Australia), Professor in the Department of Geological and Atmospheric Sciences, Iowa State University. He is an expert on metallic mineral deposits, especially those of precious metals.
The As analogue of argyrodite and canfieldite. Interesting (possibly unique) in being a sulphosalt with two valencies of As.

Reported as the "first As3+-bearing natural argyrodite".


Classification of SpryiteHide

Approved, Pending publication
Approval Year:
2016
First Published:
2017

Physical Properties of SpryiteHide

Metallic
Colour:
Black
Streak:
Black
Hardness:
2½ - 3 on Mohs scale
Hardness:
VHN20=55 - 70 kg/mm2 - Vickers
Density:
6.334 g/cm3 (Calculated)

Chemical Properties of SpryiteHide

Formula:
Ag8(As3+0.5As5+0.5)S6
IMA Formula:
Ag8(As3+0.5As5+0.5)S6
Common Impurities:
Ge

Crystallography of SpryiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pna21
Cell Parameters:
a = 14.984(4) Å, b = 7.474(1) Å, c = 10.571(2) Å
Ratio:
a:b:c = 2.005 : 1 : 1.414
Unit Cell V:
1083.9 ų
Z:
4
Twinning:
intimately twinned; has 6 twin domains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.192 (29)
3.056 (31)
3.051 (100)
2.781 (29)
2.687 (68)
2.604 (29)
2.461 (33)
1.870 (37)

Type Occurrence of SpryiteHide

Place of Conservation of Type Material:
mineralogical collections of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, Florence, Italy (catalogue number 3213/I)
Geological Setting of Type Material:
Silver and manganese-rich zone of a polymetallic deposit
Reference:
Bindi, L., Keutsch, F.N., Morana, M., Zaccarini, F. (2017) Spryite, Ag8(As3+0.5As5+0.5)S6: structure determination and inferred absence of superionic conduction of the first As3+-bearing argyrodite. Physics and Chemistry of Minerals: 44: 75–82.

Synonyms of SpryiteHide

Relationship of Spryite to other SpeciesHide

Other Members of this group:
AlburniteAg8GeTe2S4Iso.
ArgyroditeAg8GeS6Orth. mm2 : Pna21
CanfielditeAg8SnS6Orth. mm2
Putzite(Cu4.7Ag3.3)GeS6Iso. 4 3m : F4 3m

Fluorescence of SpryiteHide

Not fluorescent

Other InformationHide

Notes:
no evidence of fast ionic conduction is known
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 SpryiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L., Keutsch, F.N., Zaccarini, F. (2016) Spryite, IMA No. 2015-116. CNMNC Newsletter No. 30, April 2016; Mineralogical Magazine: 80: 407–413.
Bindi, L., Keutsch, F.N., Morana, M., Zaccarini, F. (2017) Spryite, Ag8(As3+0.5As5+0.5)S6: structure determination and inferred absence of superionic conduction of the first As3+-bearing argyrodite. Physics and Chemistry of Minerals: 44: 75–82.

Internet Links for SpryiteHide

Localities for SpryiteHide

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.
Peru (TL)
 
  • Lima Department
    • Oyon Province
Bindi, L., Keutsch, F.N., Zaccarini, F. (2016): Spryite, IMA No. 2015-116. CNMNC Newsletter No. 30, April 2016; Mineralogical Magazine: 80: 407–413
Mineral and/or Locality  
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