Calciodelrioite, Ca(VO3)(2)(H2O)(4), the Ca analogue of delrioite, Sr(VO3)(2)(H2O)(4)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F12%3A00107085" target="_blank" >RIV/00216224:14310/12:00107085 - isvavai.cz</a>

Result on the web

<a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.882.352&rep=rep1&type=pdf" target="_blank" >http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.882.352&rep=rep1&type=pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/minmag.2012.076.7.12" target="_blank" >10.1180/minmag.2012.076.7.12</a>

Result language

angličtina

Original language name

Calciodelrioite, Ca(VO3)(2)(H2O)(4), the Ca analogue of delrioite, Sr(VO3)(2)(H2O)(4)

Original language description

Calciodelrioite, ideally Ca(VO3)(2)(H2O)(4), is a new mineral (IMA 2012-031) from the uranium-vanadium deposits of the eastern Colorado Plateau in the USA. The type locality is the West Sunday mine, Slick Rock district, San Miguel County, Colorado. The new mineral occurs on fracture surfaces in corvusite- and montroseite-impregnated sandstone and forms as a result of the oxidative alteration of these phases. At the West Sunday mine, calciodelrioite is associated with celestine, gypsum, huemulite, metarossite, pascoite and rossite. The mineral occurs as transparent colourless needles, bundles of tan to brown needles and star bursts of nearly black broad blades composed of tightly intergrown needles. Crystals are elongate and striated parallel to [100], exhibiting the prismatic forms {001} and {011} and having terminations possibly composed of the forms {100} and {61 (1) over bar}. The mineral is transparent and has a white streak, subadamantine lustre, Mohs hardness of about 2 1/2, brittle tenacity, irregular to splintery fracture, one perfect cleavage on {001} and possibly one or more additional cleavages parallel to [100]. Calciodelrioite is soluble in water. The calculated density is 2.451 g cm(-3). It is optically biaxial (+) with alpha = 1.733(3), beta = 1.775(3), gamma = 1.825(3) (white light), 2V(meas) = 87.3(9)degrees and 2V(calc) = 87 degrees. The optical orientation is X = b; Z approximate to a. No pleochroism was observed. Electron-microprobe analyses of two calciodelrioite samples and type delrioite provided the empirical formulae (Ca0.88Sr0.07Na0.04K0.01)(Sigma 1.00)(V1.00O3)(2)(H2.01O)(4), (Ca0.76Sr0.21Na0.01)(Sigma 0.98)(V1.00O3)(2)(H2.01O)(4) and (Sr0.67Ca0.32)(Sigma 0.99)(V1.00O3)(2)(H2.00O)(4), respectively. Calciodelrioite is monoclinic, I2/a, with unit-cell parameters a = 14.6389(10), b = 6.9591(4), c = 17.052(2) angstrom, beta = 102.568(9)degrees, V = 1695.5(3) angstrom(3) and Z = 8. The seven strongest lines in the X-ray powder diffraction pattern [listed as d(obs) angstrom(I)(hkl)] are as follows: 6.450(100)(011); 4.350(16)(013); 3.489(18)(020); 3.215(17)(022); 3.027(50)(multiple); 2.560(28)((4) over bar 15,413); 1.786(18)(028). In the structure of calciodelrioite (refined to R-1 = 3.14% for 1216 F-o &gt; 4 sigma F), V5+O5 polyhedra link by sharing edges to form a zigzag divanadate [VO3] chain along a, similar to that in the structure of rossite. The chains are linked via bonds to Ca atoms, which also bond to H2O groups, yielding CaO3(H2O)(6) polyhedra. The Ca polyhedra form a chain along b. Each of the two symmetrically independent VO5 polyhedra has two short vanadyl bonds and three long equatorial bonds. Calciodelrioite and delrioite are isostructural and are the endmembers of the series Ca(VO3)(2)(H2O)(4)-Sr(VO3)(2)(H2O)(4). Calciodelrioite is dimorphous with rossite, which has a similar structure; however, the smaller 8-coordinate Ca site in rossite does not accommodate Sr.

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

2012

Confidentiality

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

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

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Volume of the periodical

76

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

2803-2817

UT code for WoS article

000323908500012

EID of the result in the Scopus database

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