Stangersite, a new tin germanium sulfide, from the Kateřina mine, Radvanice near Trutnov, Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F20%3A10134888" target="_blank" >RIV/00023272:_____/20:10134888 - isvavai.cz</a>

Result on the web

<a href="http://www.jgeosci.org/content/jgeosci.306_Sejkora.pdf" target="_blank" >http://www.jgeosci.org/content/jgeosci.306_Sejkora.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.306" target="_blank" >10.3190/jgeosci.306</a>

Result language

angličtina

Original language name

Stangersite, a new tin germanium sulfide, from the Kateřina mine, Radvanice near Trutnov, Czech Republic

Original language description

The new mineral stangersite was found in the burning waste dump of abandoned Kateřina coal mine at Radvanice near Trutnov, northern Bohemia, Czech Republic. The new mineral occurs as well-formed, flattened, acicular crystals with a cross-section of 2-5 x 20-40 μm and up to 1 cm in length. They constitute random or fan-shaped clusters on rock fragments and on crumbly black ash in association with greenockite, herzenbergite, unnamed GeS2 and GeAsS. Stangersite was also observed as irregular grains, up to 100 μm in size, in the multicomponent aggregates on which the above-described crystals grow. Stangersite formed under reducing conditions by direct crystallization from hot gasses (250-350 oC) containing Cl and F, at a depth of 30-60 cm under the surface of the dump. Stangersite is brittle (aggregates) or elastic, to flexible (acicular crystals). It is orange to yellowish red with a very light yellowish brown streak, translucent to transparent in transmitted light, and has vitreous to adamantine luster. The VHN microhardness is 55 kp.mm-2 (539 MPa) and corresponds to Mohs hardness about 2; the calculated density is 3.98 g.cm-3. In the reflected light, stangersite is light greyish white. Anisotropy under crossed polars is strong with dark brownish grey to reddish-brown or brownish violet rotation tints. The empirical formula, based on electron-microprobe analyses of acicular crystals of stangersite, is Sn1.02Ge0.94(S2.93Se0.10)Σ3.03. Stangersite is monoclinic, P21/c, a = 7.2704(15), b = 10.197(2), c = 6.8463(14) Å, β = 105.34(3)o, with V = 489.5 Å3 and Z = 4. Stangersite has a layered structure, with corrugated (100) layers of Sn2+S5 coordination pyramids and with interspaces filled by lone electron pairs of Sn2+ and [001] chains of Ge4+S4 coordination tetrahedra. The Raman spectrum of stangersite with tentative band assignments is given. We named the mineral after its chemical constituents: Sn (stannum), Ge (germanium) and S (sulphur).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Journal of Geosciences

ISSN

1802-6222

e-ISSN

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Volume of the periodical

65

Issue of the periodical within the volume

3

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

12

Pages from-to

141-152

UT code for WoS article

000580587700002

EID of the result in the Scopus database

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