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

Kód výsledku v 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>

Výsledek na webu

<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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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

10504 - Mineralogy

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Mineralia Slovaca

ISSN

0369-2086

e-ISSN

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Svazek periodika

49

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

8

Strana od-do

169-176

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85048050658