Where it forms, where it's found
- Geological setting
Black uranium ores in conglomerate
- Type locality
- Ningyo-toge mine
- Tottori Prefecture
- Japan
35.3083°, 133.9228°
25recorded occurrences
Radioactivity
Physical
Optical
- Optical type
- Biaxial
- Refractive index
- 1.64 – 1.71
- Surface relief
- High
- Principal indices
- nα 1.69 – 1.70 · nβ 1.64 – 1.71
- Pleochroism
- Weak
Paler in X direction
- Dispersion
- not discernible
Crystallography
- Cell parameters
- a = 6.78 Å · b = 12.1 Å · c = 6.38 Å
- Ratio a:b:c
- 1 : 1.785 : 0.941
- Type-locality form
Unoxidized zone, usually as a thin coating on pyrite and apatite or filling cavities in the conglomerate.
- Comment
May be hexagonal or trigonal (see Scharmová & Scharm (1994) and references cited therein).
Chemical composition
Synonyms
- Ningyoiet
In other languages
- German
- Ningyoit
- Italian
- Ningyoite
- Japanese
- 人形石
Classification
Strunz
10th ed.8.CJ.85
- 8Phosphates, Arsenates, VanadatesClass
- 8.CPhosphates without additional anions, with H2ODivision
- 8.CJWith only large cationsGroup
- 8.CJ.85NingyoiteSpecies
Dana
8th ed.40.04.08.01
- 40Hydrated Normal Phosphates, Arsenates and VanadatesClass
- 40.04(AB)5(XO4)2·xH2OType
- 40.04.08Ningyoite GroupGroup
- 40.04.08.01NingyoiteSpecies
CIM
—19.11.13
- 19PhosphatesClass
- 19.11Phosphates of UGroup
- 19.11.13NingyoiteSpecies
Literature, links & citation
Citations
- 1959Muto, T., Meyrowitz, R., Pommer, A. M., Murano, T. (1959) Ningyoite, a new uranous phosphate from Japan. American Mineralogist, 44 (5-6) 633-650
- 1960Fleischer, M.; Chao, E.C.T. (1960) New mineral names. American Mineralogist, 45 (5-6). 753-756
- 1962MUTO, TADASHI (1962) The precipitation environment of ningyoite. Mineralogical Journal, 3 (5). 306-337 doi:10.2465/minerj1953.3.306 DOI: 10.2465/minerj1953.3.306
- 1965MUTO, TADASHI (1965) Thermochemical stability of ningyoite. Mineralogical Journal, 4 (4). 245-274 doi:10.2465/minerj1953.4.245 DOI: 10.2465/minerj1953.4.245
- 1970Kajitani, Kei (1970) A geochemical study on the genesis of ningyoite the special calcium uranous phosphate mineral. Economic Geology, 65 (4) 470-480 doi:10.2113/gsecongeo.65.4.470DOI: 10.2113/gsecongeo.65.4.470
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Ningyoite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/ningyoite-2906},
note = {Accessed 2026-05-11}
}