Dobrá Voda, Velké Meziříčí, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic

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Dobrá Voda

Granitic lepidolite pegmatite in Strážek Moldanubicum. Symetracilly zoned steeply dipping dyke up to 6 m thick and about 100 m long in amphibolite and gneiss. Known since 1934.

It consists of (1) a volumetrically dominant marginal granitic unit, (2) a graphic unit, (3) a coarse-grained albite unit with blocks of K feldspar, which is subdivided into three subunits: (3a) muscovite albite, (3b) outer lepidolite–albite, and (3c) inner lepidolite–albite. Subunit 3c is adjacent to (4) a lepidolite unit in the central part of the dike. Amblygonite–montebrasite and pseudomorphs of spodumene + quartz intergrowths after petalite occur in subunits (3b) and (3c). Typical accessory minerals include andalusite, dumortierite, (Nb,Ta)-oxide minerals (manganocolumbite, stibiotantalite, microlite, manganotantalite), apatite, zircon and cassiterite (Novák & Staněk 1999, Novák & Taylor 2000).

NOTE: Not to be confused with the Dobrá Voda locality in Bohemia (Ag-(Au)-polymetallic mineralization).

References

- Ercit, T.S., Černý, P., Hawthorne, F.C. (1993) Cesstibtantite: a geologic introduction to the inverse pyrochlores. Mineralogy and Petrology: 48: 235-255.
- Novak & Srein (1998) Niobian cesstibtantite from Dobra Voda lepidolite pegmatite, western Moravia, Czech Republic. Neues Jahrbuch Miner., Mh. 354-360.
- Novák, M., Staněk, J. (1999): Lepidolitový pegmatit od Dobré Vody u Velkého Meziříčí, západní Morava. Acta Musei Moraviae, Scientiae geologicae, roč. 84, s. 3-44.
- Novák, M., Taylor, M.C. (2000): FOITITE: FORMATION DURING LATE STAGES OF EVOLUTION OF COMPLEX GRANITIC PEGMATITES AT DOBRÁ VODA, CZECH REPUBLIC, AND PALA, CALIFORNIA, U.S.A. Canadian Mineralogist 38 (2000) 1399-1408.

Mineral List

Albite var: Oligoclase Amblygonite Andalusite 'Apatite' Biotite Cassiterite Columbite-(Mn) Cookeite

Dumortierite Elbaite Foitite Halloysite Kaolinite Microcline Microlite Group var: Cesstibtantite Montebrasite

Montmorillonite Muscovite Opal Orthoclase Quartz var: Chalcedony var: Rock Crystal var: Smoky Quartz Rossmanite

Schorl Spodumene 'Stibiomicrolite (of Groat et al)' Stibiotantalite Tantalite-(Mn) Topaz Trilithionite Zircon

35 entries listed. 26 valid minerals.