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Mineralpedia Details for Cejkaite

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Cejkaite

Cejkaite

Named for Dr. Jiri Cejka, a Czech mineralogist who was the former Director at the National Museum in Prague, and who specialized in spectrography and uranium minerals. Forms as extremely small, pale yellow crystals that have a hexagonal outline. Found as earthy efflorescences on a calcite vein in association with disseminated uraninite at its type locality at Jachymov in Bohemia in the Czech Republic. Few additional localities are known. Cejkaite is highly radioactive and will fluoresce a yellow to yellow-green under ultraviolet light.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and American Mineralogist 88 (2003), 686

Formula
Na4UO2(CO3)3 
Crystal System
Triclinic 
Crystal Habit
Pseudo Hexagonal, Microscopic Crystals 
Luster
Vitreous (Glassy) 
Color
pale yellow, beige 
Streak
light yellow 
Class
Triclinic 
Hardness
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Cejkaite from Jachymov, Erzgegirge, Bohemia, Czech Republic

Cejkaite
            from Jachymov, Erzgegirge, Bohemia, Czech Republic

Canary yellow platy, very tiny crystals in aggregate patches to 3mm across.

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Cejkaite from Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic

Cejkaite
            from Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic

Superb yellow flattend balls to 0.5 to 1mm across. Rich.

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Cejkaite from Apex mine, Lander Co., Nevada, United States

Cejkaite
            from Apex mine, Lander Co., Nevada, United States

Pulverulent bright yellow Cejkaite covering much of matrix. This is another new occurence for the State of Nevada, and is the first reported occurence in the USA. 

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