Where it forms, where it's found
- Type locality
- Walpurgis Flacher vein
- Weißer Hirsch Mine (shaft 3)
- Neustädtel
- Schneeberg
- Erzgebirgskreis
- Saxony
- Germany
50.5883°, 12.6389°
46recorded occurrences
Radioactivity
Physical
- Hardness
- 1Talc
- 2Gypsum
- 3Calcite
- 4Fluorite
- 5Apatite
- 6Orthoclase
- 7Quartz
- 8Topaz
- 9Corundum
- 10Diamond
- Transparency
- Transparent
- Colour
- Light yellow · straw yellow
- Streak
- White, pale yellow
- Cleavage
- Perfect
Perfect on (001), good on (100) and (010). Less pronounced than the lower hydration levels (i.e. nováčekite and metanováčekite).
Optical
- Optical type
- Uniaxial (-)
- Refractive index
- 1.62 – 1.641
- Surface relief
- Moderate
- Principal indices
- nω 1.62 – 1.641 · nε 1.62 – 1.625
- Notes
Symmetry requires pseudo-uniaxial optical character.
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation80 nm
Order1st order
XPL colour
Crystallography
- Cell parameters
- a = 7.1594 Å · b = 7.161 Å · c = 11.3146 Å
- Cell angles
- α = 81.391 ° · β = 81.177 ° · γ = 88.884 °
- Ratio a:b:c
- 1 : 1.000 : 1.580
- Comment
Pseudo-tetragonal (long axis ~22 A).
Crystal structure
Chemical composition
Synonyms
- Hydronováčekiet
- Novacikit
In other languages
- French
- Nováčekite-I
- German
- Hydronováčekit · Novacekit · Nováčekit-I
- Spanish
- Novacekita
- Italian
- idronováčekite · Novacekite · Nováčekite I
Classification
Strunz
10th ed.8.EB.05
- 8Phosphates, Arsenates, VanadatesClass
- 8.EUranyl phosphates and arsenatesDivision
- 8.EBUO2:RO4 = 1:1Group
- 8.EB.05HydronováčekiteSpecies
Dana
8th ed.40.2a.10.01
- 40Hydrated Normal Phosphates, Arsenates and VanadatesClass
- 40.2aAB2(XO4)2·xH2O, containing (UO2)2+Type
- 40.2a.10— unnamed intermediate level —Group
- 40.2a.10.01HydronováčekiteSpecies
CIM
—20.7.7
- 20Arsenates (also arsenates with phosphate, but without other anions)Class
- 20.7Arsenates of UGroup
- 20.7.7HydronováčekiteSpecies
Group, growth & confusion
AutuniteCa(UO2)2(PO4)2 · 10-12H2OMineral—
BassetiteFe2+(UO2)2(PO4)2(H2O)10Mineral—
HeinrichiteBa(UO2)2(AsO4)2 · 10H2OMineral—- KahleriteFe2+(UO2)2(AsO4)2 · 12H2OMineral—
NováčekiteMg(UO2)2(AsO4)2 · 10H2OMineral—- RauchiteNi(UO2)2(AsO4)2 · 10H2OMineral—
SabugaliteHAl(UO2)4(PO4)4 · 16H2OMineral—
SaléeiteMg(UO2)2(PO4)2(H2O)10Mineral—
TorberniteCu(UO2)2(PO4)2 · 12H2OMineral—
UranocirciteBa(UO2)2(PO4)2 · 10H2OMineral—
Literature, links & citation
Citations
- 1951Frondel, Clifford (1951) Studies of uranium minerals (IX): Saléeite and novacekite. American Mineralogist, 36 (9-10) 680-686
- 1954Stern, T. W., Annell, C. S. (1954) A second locality of novacekite. American Mineralogist, 39 (7-8) 675-676
- 1956Huang, W. T. (1956) Novacekite from the Wichita Mountains, Oklahoma. American Mineralogist, 41 (1-2) 152-153
- 1961Walenta, K., Wimmenauer, W. (1961) Der Mineralbestand des Michaelganges im Weiler bei Lahr (Schwarzwald). Jahreshefte des Geologischen Landesamts Baden-Württemberg: 4: 7-37 (in German).
- 1964Walenta, Kurt, Walenta, Kurt (1964) Beiträge zur Kenntnis seltener Arsenatmineralien unter besonderer Berücksichtigung von Vorkommen des Schwarzwaldes. 1. Folge. [Rare arsenate minerals with special consideration of occurrences in the Black Forest. Part I]. Tschermaks Mineralogische und Petrographische Mitteilungen, 9 (1). 111-174 doi:10.1007/bf01127780DOI: 10.1007/bf01127780
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Hydronováčekite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/hydronovacekite-2937},
note = {Accessed 2026-05-11}
}