Cryptomelane, K(Mn4+7Mn3+)O16,from the Dúbravica-Zolnica Fe deposit (North Veporic Unit, Slovak Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F17%3A10133862" target="_blank" >RIV/00023272:_____/17:10133862 - isvavai.cz</a>

Result on the web

<a href="http://www.geology.sk/new/sites/default/files/media/doc/min_slov/ms_2017_2/05_MS2_2017-Polak.pdf" target="_blank" >http://www.geology.sk/new/sites/default/files/media/doc/min_slov/ms_2017_2/05_MS2_2017-Polak.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Cryptomelane, K(Mn4+7Mn3+)O16,from the Dúbravica-Zolnica Fe deposit (North Veporic Unit, Slovak Republic)

Original language description

Cryptomelane, K(Mn4+7Mn3+)O12, representing a member of the coronadite group and hollandite super-group, is described from the abandoned Fe deposit Dúbravica-Zolnica (near the town of Banská Bystrica, Central Slovakia). Cryptomelane occurs in association with two generations of goethite and limonite. Cryptomelane is located on the cracks and in cavities of Lower Triassic quartzites, arkoses and sandstones of the Lúžna Formation (North Veporic Unit). It forms net of irregular veins of the steel grey to blue grey colour and botryoidal aggregates of steel grey colour. The thickness of veins is up to 3 mm. Botryoidal aggregates occur on the area of up to 2 x 3 mm. The lustre is in both cases earthy to dull, or metallic. Cryptomelane was confirmed by Raman spectroscopy and EPMA-WDS analyses. Its empirical formula is (in the mean of 8 point analyses): (K0.64Na0.06Ba0.02Sr0.01Ca0.01Zn0.01Co0.01)Σ0.76[(Mn4+6.97U6+0.02P0.01)Σ7.00(Mn3+0.83Fe3+0.12)Σ0.95]O16.00. Cryptomelane has a tunnel structure, in the case of this study these tunnels are occupied by water molecules. It is a weathering product of primary manganese mineral phases (probably rhodonite, pyrolusite or braunite). Formation of cryptomelane indicates slight change in pH and Eh. It precipitates at higher pH values, than associated Fe oxihydroxide minerals. The coexistence of iron and manganese oxidic minerals well corresponds to iron residual deposit.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Mineralia Slovaca

ISSN

0369-2086

e-ISSN

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Volume of the periodical

49

Issue of the periodical within the volume

2

Country of publishing house

SK - SLOVAKIA

Number of pages

8

Pages from-to

169-176

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85048050658