Cejkaite	IMA-A 1999-045
Uranium	14.1.7.1 (Dana Classification Number)
(No Images)	5/F.02-05 (Strunz ID)

Property	Data	Remarks
Named for:	Jiri Cejka (1929 - ), Director Natural Historic section, National Museum, Prag, for his numerous contributions to the crystal chemistry of Uranium minerals
Alternate     Name(s):
Mineral Class:	Nitrates, Carbonates and Borates   Uranylcarbonates ([UO2]+2 - [CO3]-2)     Grimselite - Liebigite series
Chemical     Formula:	Na3.8-4[UO2|(CO3)3]
Chemical     Composition:	Carbon: (C) 6.70% Oxygen: (O) 32.75% Sodium: (Na) 16.26% Uranium: (U) 44.29%	by weight
Molecular     Weight:	537.42	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 7.9281 × 1004 2.14 × 10-06 1.11 11.08 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System: Triclinic Axial Ratios: a: 0.9983 b: 1 c: 1.3839 Cell Dimensions: a: 9.28 Å b: 9.295 Å c: 12.864 Å Z: 4 a: 90.293° b: 91.124° g: 119.548° V: 965.11 Å3 DenCalc: 3.70 H-M Symbol:   Space Group: P1 or P1- X-Ray Diffraction:   By Intensity ( I/Io ) (1): 4.639 Å   (1+20,210,110) (0.92): 8.022 Å   (110,010,100) (0.68): 4.967 Å   [012, 102] (0.63): 3.221 Å   [004] (0.6): 2.681 Å   [330, 114, 030] (0.6): 5.024 Å   [112]
Habit:	Grains Pseudo Hexagonal Crystals Microscopic Crystals
Cleavage:	[001]   [010]   [100]
Fracture:
Moh's     Hardness:
Density:	3.67	grams/cm3
Color:	Pale yellow, Beige
Streak:	Light yellow
Luster:	Vitreous, Earthy
Diaphaneity:	Opaque
Pleochroism:	(x):   (y:)   (z:)
Ultra Violet     Fluorescence:	Long Wave: Yellow, weak Short Wave: Greenish-yellow, weak
Magnetism:	Non-magnetic
Occurance:	Secondary mineral associated with decomposed uraninite. Formed in a relatively dry environment in a restricted pH (6.5-11.5, non-acidic) range
Associated     Minerals:	Acanthite, Albrechtschraufite, Andersonite, Antimony, Antlerite, Aragonite, 'Argentite', Argentopyrite, Arsenic, Arsenopyrite, Arsenuranospathite, Autunite, Barite, Becquerelite, Biotite, Bismuth, Bornite, Calcite, Cassiterite, Cejkaite, Cerussite, 'Chlorite Group', Chrysocolla, Cinnabar, Cobaltite, Coffinite, Compreignacite, Copper, Cuprite, Cuprosklodowskite, Curienite, Dewindtite, Diopside, Dolomite, Epidote, Fluorapatite, Fluorite, Galena, Gold, Graphite, Gypsum, Hematite, 'Hydronium Uranospinite', Illite, Jarosite, Johannite, Jáchymovite, Kahlerite, Kamotoite-(Y), Kaolinite, Kasolite, Lavendulan, Liebigite, 'Limonite', Magnesium-Zippeite, Magnetite, Malachite, Manganite, Marcasite, Masuyite, Meta-Autunite, Meta-Uranopilite, 'Meta-uranospinite', Metalodevite, Metanovácekite, Metaschoepite, Metatorbernite, Metatyuyamunite, Metazellerite, Metazeunerite, Mimetite, Mixite, Molybdenite, Muscovite, Natrolite, Nickel-Skutterudite, Nickel-Zippeite, Nickeline, Novácekite, 'Olivine', Opal, Orpiment, (P analogue of Walpurgite), Pharmacosiderite, Phosphuranylite, Pyrite, Pyrrhotite, Quartz, Rabbittite, Rabejacite, Realgar, Rhodochrosite, Richetite, Rutile, Schoepite, Schröckingerite, 'Serpentine Group', Siderite, Silver, Sklodowskite, Skutterudite, Smithsonite, Soddyite, Sodium-Zippeite, Sphalerite, Stibnite, Sulphur, Titanite, Topaz, Torbernite, 'Tourmaline Group', Trögerite, Tyuyamunite, Urancalcarite, Uraninite, Uranocircite, Uranophane, Uranophane-beta, Uranopilite, Uranospathite, Uranosphaerite, Uranospinite, Vandendriesscheite, Vesuvianite, Vochtenite, Voglite, Walpurgite, Weeksite, Widenmannite, 'Wolframite', Wolsendorfite, Wulfenite, Xenotime-(Y), Yingjiangite, Zellerite, Zeunerite, Zippeite, Znucalite, Selenite Minerals   -   Uranium & Thorium mineral links	These are a few minerals known to be found with Cejkaite
Localities:	Extremely rare (Only about 12 specimens are known) Cejkaite Localities
Notes:	Radioactive a- and b-particles, g-rays. Related to grimselite