Where it forms, where it's found
- Geological setting
Forms in granite-porphyry.
- Type locality
- Oktyabr'skoye U Deposit
- Kyzyltyube-Sai
- Khodzhent (Leninabad)
- Sughd
- Tajikistan
1recorded occurrences
Radioactivity
Physical
- Colour
- Lemon yellow
Optical
- Pleochroism
- Weak
X = pale green, Z = green.
- Extinction
- Parallel.
- UV response
- Distinctly fluorescent in greenish yellow under ultraviolet light.
- Notes
Interference colors are gray in thin-sections of normal thickness. The indices of refraction are very near each other.
Crystallography
- Cell parameters
- a = 14.09(6) Å · b = 17.87(1) Å · c = 18.24 Å
- Ratio a:b:c
- 1 : 1.268 : 1.295
- Type-locality form
Forms acicular crystals, spherulites and earthy masses.
- Comment
Poorly defined crystallography
Chemical composition
Synonyms
- Ca-ursilit
- Calcioursiliet
- Calcium-ursilite
In other languages
- German
- Calcioursilit
- Spanish
- Calcioursilita
- Italian
- calcioursilite
Classification
Strunz
10th ed.9.AK.35
- 9SilicatesClass
- 9.ANesosilicatesDivision
- 9.AKUranyl neso- and polysilicatesGroup
- 9.AK.35CalcioursiliteSpecies
Literature, links & citation
Citations
- 1957Chernikov A A, Krumetskaia O V, Sidel'nikova V D (1957): Ursilite - a new silicate of uranium. Atomnaya Energiya Voprosy Geologii Urana, Supplement 6, 61-65.
- 1957Chernikov A A, Krutetskaya O V, Sidelnikova V D (1957): Ursilite - a new silicate of uranium. Atomnaya Energiya Voprosy Geologii Urana, Supplement 6, 73-77 (in Russian).
- 1977Chernikov, A.A., Sidorenko, G.A., Valueva, A.A. (1977): New data on uranyl minerals of the ursilite-weeksite group. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 106 (5), 553-564 (in Russian).
- 2018Plášil, Jakub (2018) Mineralogy, Crystallography and Structural Complexity of Natural Uranyl Silicates. Minerals, 8 (12) 551 doi:10.3390/min8120551DOI: 10.3390/min8120551
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Calcioursilite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/calcioursilite-11360},
note = {Accessed 2026-05-11}
}