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More properly spelled, Metanováčekite is named as a mineral relating to novacekite with lower hydration, hence the prefix meta-. Intuitively, metanovacekite forms as a dehydration product of novacekite and can be found in Germany, England, and the United States as well as newer localities in Morocco and Namibia. Metanovacekite is highly radioactive and will fluoresce yellow to green under ultraviolet light. Metanovacekite can be reversibly hydrated back to novacekite under ambient conditions.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/metanovacekite.pdf

Named as a mineral relating to rossite with lower hydration, hence the prefix meta-. Metarossite occurs in only a few localities in the United States, the Czech Republic, and Russia. At its type locality in Bull Pen Canyon in Colorado, USA, it occurs “in veinlets in carnotite-bearing sandstone.” There it also forms associated with rossite, carnotite, and gypsum. Metarossite is soluble in water and will reversibly alter to rossite upon exposure to dry air.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/metarossite.pdf

Named as a mineral relating to sideronatrite with lower hydration, hence the prefix meta-. Metasideronatrite is a rare mineral that occurs usually in arid climates as an uncommon alteration product of pyrite, but is also stably formed in environments around the sea. Metasideronatrite occurs in localities in Chile, the United States, Spain and Italy among just a couple others. Under appropriate conditions, Metasideronatrite can reversibly alter to sideronatrite depending on the humidity and exposure of the material to sunlight however it will completely decompose in boiling water.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/metasideronatrite.pdf

Named as a mineral relating to uranocircite with lower hydration, hence the prefix meta-, Metauranocircite is a dehydrated form of Uranocircite, which in turn is named for its uranium content and the Greek ford for “falcon” after its type locality at Falkenstein in Germany. Metauranocircite is usually a secondary mineral that occurs in oxidized uranium deposits and can occur as a primary mineral in low-temperature hydrothermal veins as vivid yellow-green, fluorescent, thin platy, flexble crystals from 1 to 3mm. Found in diverse geological environments with barium, uranium and phosphate components including coal deposits, hydrothermal, and alluvial.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)
Encyclopedia of Mineralogy, 1st edition Roberts & Rapp (1974).
Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/metauranocircite-I.pdf