Heinrichite

Ba(UO2)2(AsO4)2 · 10H2O
IMA status
  • Approved
  • Grandfathered
IMA symbol
Hrc
Discovered
1958
Also known as
  • Arsenouranocircit
  • Arsenouranocircita
  • Arsenouranocircite
  • +7 more

Where it forms, where it's found

Type locality
White King Mine
  1. Lakeview
  2. Lake County
  3. Oregon
  4. USA

42.3328°, -120.5208°

20recorded occurrences
Source · OpenStreetMap

Radioactivity

Physical

Hardness
123456789102.5/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond

Optical

Optical type
Uniaxial (-)
Refractive index
1.573 – 1.605
Surface relief
Moderate
Principal indices
nω 1.605 · nε 1.573
Michel-Lévy diagramhighlighted lineδ = 0.0320
Attainable Michel-Lévy rangeΔ ∈ [0, t·δmax]320 nm1st order
Δ = 0Δmax
Thin-section mosaic70 grains · random 3D orientations
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
Interference simulatorsingle grain · PPL ↔ XPL
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation320 nm
Order1st order
XPL colour

Crystallography

Crystal system
Monoclinic
Space group
P2/c
Cell parameters
a = 7.1548(11) Å · b = 7.1340(11) Å · c = 21.290(3)(21) Å
Cell angles
β = 104.171(5) °
Unit cell volume
1053.6 ų
Z
2
Comment

Data for synthetic material. Pseudotetragonal lattice.

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
92UUraniumUranium2238.029476.058
41.93%
8OOxygenOxygen2215.999351.978
31.00%
33AsArsenicArsenic274.922149.844
13.20%
56BaBariumBarium1137.327137.327
12.09%
1HHydrogenHydrogen201.00820.160
1.78%
Total1135.367100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Arsenouranocircit
  • Arsenouranocircita
  • Arsenouranocircite
  • Arsenuranocircit
  • Arsenuranocircita
  • Arsenuranocircite
  • Heinrichiet
  • Uranosandbergit
  • Uranosandbergita
  • Uranosandbergite

In other languages

French
Heinrichite
German
Arsenouranocircit · Heinrichit · Uranosandbergit
Spanish
Heinrichita
Italian
Heinrichite
Chinese
钡砷铀云母

Classification

Strunz
10th ed.

8.EB.05

  • 8Phosphates, Arsenates, VanadatesClass
  • 8.EUranyl phosphates and arsenatesDivision
  • 8.EBUO2:RO4 = 1:1Group
  • 8.EB.05HeinrichiteSpecies
Dana
8th ed.

40.2a.04.01

  • 40Hydrated Normal Phosphates, Arsenates and VanadatesClass
  • 40.2aAB2(XO4)2·xH2O, containing (UO2)2+Type
  • 40.2a.04— unnamed intermediate level —Group
  • 40.2a.04.01HeinrichiteSpecies
CIM

20.7.12

  • 20Arsenates (also arsenates with phosphate, but without other anions)Class
  • 20.7Arsenates of UGroup
  • 20.7.12HeinrichiteSpecies

Group, growth & confusion

Often grow together
1 mineral

Literature, links & citation

Citations
  1. 1958Gross, E. B., Corey, A. S., Mitchell, R. S., Walenta, K. (1958) Heinrichite and metaheinrichite, hydrated barium uranyl arsenate minerals. American Mineralogist, 43 (11-12) 1134-1143
  2. 1965Walenta, Kurt (1965) Beiträge zur Kenntnis seltener Arsenatmineralien unter besonderer Berücksichtigung von Vorkommen des Schwarzwaldes. 2. Folge [Rare arsenate minerals with special consideration of occurrences in the Black Forest. Part II]. Mineralogy and Petrology, 9 (3). 252-282 doi:10.1007/bf01128088DOI: 10.1007/bf01128088
  3. 2005Locock, A. J., Burns, P. C., Flynn, T. M. (2005) Structures of strontium- and barium-dominant compounds that contain the autunite-type sheet. The Canadian Mineralogist, 43 (2) 721-733 doi:10.2113/gscanmin.43.2.721 DOI: 10.2113/gscanmin.43.2.721
  4. 2005Frost, Ray L., Carmody, Onuma, Erickson, Kristy L., Weier, Matt L. (2005) Near-infrared spectroscopy to uranyl arsenates of the autunite and metaautunite group. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 61 (8) 1923-1927 doi:10.1016/j.saa.2004.07.023DOI: 10.1016/j.saa.2004.07.023
  5. 2016Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - Eds. (2016) Handbook of Mineralogy. https://www.handbookofmineralogy.org/
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Heinrichite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/heinrichite-1848},
  note      = {Accessed 2026-05-11}
}