Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Miargyrite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
AgSbS2
System:
Monoclinic
Colour:
Black with dark red ...
Hardness:
Name:
From Greek "meion" (less) and "argyros" (silver), for it contains less silver than pyrargyrite which it was often mistaken for.
The monoclinic dimorph of Cuboargyrite and Baumstarkite.

Black blocky, often striated crystals with dark red internal reflections to a cm. The crystals are difficult to orient and often form balls to a few cm.

Classification of Miargyrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.HA.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
A : With Cu, Ag, Fe (without Pb)
3.7.3.2

3 : SULFOSALTS
7 : ø = 2
5.2.8

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
mindat.org URL:
http://www.mindat.org/min-2702.html
Please feel free to link to this page.

First Recorded Occurrence of Miargyrite

Year of Discovery:
1824

Physical Properties of Miargyrite

Metallic
Colour:
Black with dark red internal reflections
Streak:
Cherry red
Hardness (Mohs):
Hardness Data:
Measured
Cleavage:
Imperfect/Fair
Imperfect on 010, rare on 100 and 101
Fracture:
Sub-Conchoidal
Density:
5.25 g/cm3 (Measured)    5.29 g/cm3 (Calculated)

Crystallography of Miargyrite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Cell Parameters:
a = 13.22Å, b = 4.411Å, c = 12.862Å
β = 98.633°
Ratio:
a:b:c = 2.997 : 1 : 2.916
Unit Cell Volume:
V 741.53 ų (Calculated from Unit Cell)
Morphology:
Black blocky often striated xls.

Crystallographic forms of Miargyrite

Crystal Atlas:
Image Loading
Click on an icon to view
Miargyrite - {100}, {010}, {001}, modified
Miargyrite - equant crystal
3d models and HTML5 code kindly provided by www.smorf.nl.

Toggle
Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Optical Data of Miargyrite

Type:
Biaxial (+)
RI values:
nα = 2.720 - 2.800
Max Birefringence:
δ = 2.720
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Internal Reflections:
dark red internal reflections

Chemical Properties of Miargyrite

Formula:
AgSbS2
Essential elements:
All elements listed in formula:
Empirical Formula:
AgSbS2
Common Impurities:
As,Fe

Relationship of Miargyrite to other Species

2.HA.05ChalcostibiteCuSbS2
2.HA.05EmplectiteCuBiS2
2.HA.20BerthieriteFeSb2S4
2.HA.20GaravelliteFeSbBiS4
2.HA.20CleriteMnSb2S4
2.HA.25AramayoiteAg(Sb,Bi)S2
2.HA.25BaumstarkiteAgSbS2
5.2.1SmithiteAgAsS2
5.2.2TrechmanniteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-x
5.2.16AramayoiteAg(Sb,Bi)S2
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19Pavonite(Ag,Cu)(Bi,Pb)3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.23BenleonarditeAg8(Sb,As)Te2S3
5.2.24VolynskiteAgBiTe2

Other Names for Miargyrite

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 Miargyrite

Reference List:
Hausmann (1805), Hercyn. Archiv: 4: 680.

Mohs, F. (1824): Hemiprismatische Rubinblende.- Grundriss der Mineralogie, vol. II, p. 606-607.

Rose, H. (1829): Ueber die in der Natur vorkommenden nicht oxydirten Verbindungen des Antimons und des Arseniks.- Poggendorffs Annalen der Physik und Chemie 15, 451-476.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 424-427.

Mineralogical Magazine (1997): 61: 671-675.

Effenberger, H., Paar, W.H., Topa, D., Criddle, A.J., and Fleck, M. (2002) The new mineal baumstarkite and a structural reinvestigation of aramayoite and miargyrite. American Mineralogist: 87: 753-764.

Acta Crystallographica: 17: 847-851.

Internet Links for Miargyrite

Specimens:
The following Miargyrite specimens are currently listed for sale on minfind.com.

Localities for Miargyrite

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.
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 28, 2015 20:23:58 Page generated: January 27, 2015 16:48:08