Scordariite

K8(Fe3+0.670.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11
IMA status
  • Approved
IMA symbol
Sda
IMA approved
2019
Also known as
  • IMA2019-010
  • Scordariiet

Where it forms, where it's found

Geological setting

Oxidation of pyrite in old stopes.

Type locality
Monte Arsiccio Mine
  1. Sant'Anna di Stazzema
  2. Stazzema
  3. Lucca Province
  4. Tuscany
  5. Italy

43.9654°, 10.2836°

1recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789102 – 2.5/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Transparent
Colour
Yellowish to brownish
Streak
yellowish
Tenacity
brittle
Cleavage
Perfect

(0001)

Fracture
Irregular/Uneven
Density
2.432 g/cm³

Optical

Optical type
Uniaxial (-)
Pleochroism
Visible

pale yellow to yellow

UV response
None
Notes

Mean refractive index is 1.573.

Crystallography

Crystal system
Trigonal
Space group
#80
Cell parameters
a = 9.7509(4) Å · c = 53.525(2) Å
Z
3
Type-locality form

Pseudo-hexagonal (0001) tabular crystals up to 0.5 mm in size

Crystal structure

Synonyms

  • IMA2019-010
  • Scordariiet

In other languages

German
IMA 2019-010 · Scordariit
Portuguese
IMA2019-010 · Scordariite

Classification

Strunz
10th ed.

7.DF.52

  • 7SulfatesClass
  • 7.DSulfates (selenates, etc.) with additional anions, with H2ODivision
  • 7.DFWith large and medium-sized cationsGroup
  • 7.DF.52ScordariiteSpecies

Literature, links & citation

Citations
  1. 2019Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) CNMNC Newsletter No 50, New minerals and nomenclature modifications approved in 2019. Mineralogical Magazine, 83 (4) 615-620 doi:10.1180/mgm.2019.46DOI: 10.1180/mgm.2019.46
  2. 2019Biagioni, Cristian; Bindi, Luca; Mauro, Daniela; Hålenius, Ulf (2019) Crystal Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). V. Scordariite, K8(Fe3+0.670.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11: A New Metavoltine-Related Mineral. Minerals, 9 (11). 702 doi:10.3390/min9110702 DOI: 10.3390/min9110702
  3. 2022(2022) Scordariite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Scordariite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/scordariite-53674},
  note      = {Accessed 2026-05-11}
}