Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Unnamed (Arseniosiderite-related mineral)

This page is currently not sponsored. Click here to sponsor this page.
Ca, Fe, As, O, H
An unnamed Ca-Fe3+-arsenate visually indistinguishable from arseniosiderite. Originally described by Walenta (1998) who later suggested a close relationship to wallkilldellite-Fe (Walenta, 2006).

The X-ray powder diffraction pattern is very similar to that of 'dehydrated yukonite' (cf. Ross & Post, 1997) and that of Unnamed (Pb-Fe-As-Cl-Si-Na-O-H).
See also yukonite.

Mechanical mixtures (intergrowths) of this mineral and arseniosiderite are known (U. Kolitsch, unpubl. data).

Hide all sections | Show all sections

Optical Data of Unnamed (Arseniosiderite-related mineral)Hide

Uniaxial (-)
RI values:
nω = 1.880 nε = 1.730
Max Birefringence:
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
X(E) ~colourless
Z(O) brown

Chemical Properties of Unnamed (Arseniosiderite-related mineral)Hide

Ca, Fe, As, O, H

X-Ray Powder DiffractionHide

Powder Diffraction Data:
11.76 (10)
5.68 (7)
3.28 (6)
2.96 (0.5)
2.77 (5)
2.56 (2)
1.641 (4)
Additional line at 2.25 (0.5b) observed for sample from Rotenbach locality.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Parasymplesite1 photo of Unnamed (Arseniosiderite-related mineral) associated with Parasymplesite on mindat.org.

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 Unnamed (Arseniosiderite-related mineral)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ross, D. R. & Post, J. E. (1997): New data on yukonite. Powder Diffraction 12 (2), 113-116.
Walenta, K. (1998): Ein neues arseniosideritähnliches Mineral aus dem Schwarzwald. Der Erzgräber 12, 41-48. (in German)
Walenta, K. (2006): Über das neue arseniosideritähnliche Mineral aus dem Schwarzwald und seine Beziehungen zum Wallkilldellit-Fe. Erzgräber 20, 15-17. (in German)

Internet Links for Unnamed (Arseniosiderite-related mineral)Hide

Localities for Unnamed (Arseniosiderite-related mineral)Hide

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.
  • Upper Austria
    • Eferding
: 1545: Mineralisationen (inkl. einer Paragenese von sekundären Fe-Arsenaten) aus dem Steinbruch Großstroheim bei Eferding, Oberösterreich. In: Niedermayr, G. et al. (2008): Neue Mineralfunde aus Österreich LVII. Carinthia II, 198/118, 255.
  • Atacama
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Uwe Kolitsch (powder X-ray diffraction; intergrown with arseniosiderite)
  • Baden-Württemberg
    • Black Forest
      • Feldberg area
Walenta, K. (1998): Ein neues arseniosideritähnliches Mineral aus dem Schwarzwald. Der Erzgräber 12, 41-48.
      • Sulzburg
Walenta, K. (1998): Ein neues arseniosideritähnliches Mineral aus dem Schwarzwald. Der Erzgräber 12, 41-48.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, 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: March 26, 2019 12:22:23 Page generated: March 22, 2019 00:41:00
Go to top of page