Galuskinite, Ca7(SiO4)3(CO3), a new skarn mineral from the Birkhin gabbro massif, Eastern Siberia, Russia

Lazić, Biljana; Armbruster, Thomas; Savelyeva, V. B.; Zadov, A. E.; Pertsev, N. N.; Dzierżanowski, Piotr

doi:10.1180/minmag.2011.075.5.2631

Cited by 18 publications

(5 citation statements)

References 30 publications

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“…Spurrite gave identifying peaks in XRD patterns around a 2 θ of 34° 60 . The loss on ignition value of roasted filler was determined to be 6.57 wt%, confirming the formation of spurrite for 1 h roasting as proposed from XRD observations 60–62 . Spurrite was not observed for 75 wt% MD owing to the decreased appearance of quartz, in which case calcite peaks appeared at a 2 θ of 29.5° in the XRD pattern 53 …”

Section: Resultssupporting

confidence: 52%

Phase variation and mechanical properties of waste calcium carbonate to substitute quartz in composite slab production

Baş¹,

Güler

Özer

et al. 2023

Int J Applied Ceramic Tech

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Owing to the fast‐emerging nature and rapid advancements in the construction industry, huge volumes of marble dust (MD) are generated as reject during slab cutting in marble processing, causing significant environmental hazards. Nowadays, quartz composite slabs have increasingly been preferred in building works due to their excellent hygienic property and mechanical strength. Composite slab is produced using micronized quartz as filler, the grinding of which is an energy‐intensive process. Substitution of micronized quartz with MD at different percentages was investigated in natural form and after roasting. Natural MD offered appreciable physical properties closer to those of a quartz composite slab. Physical properties slightly retrograded by quartz supplementation in the raw form. Roasting the filler led to the formation of rounded Ca–silicate. Wollastonite was the first phase formed after sintering at the lowest MD percentage and shortest roasting times. Larnite became dominating phase first by increasing MD percentage and roasting time, and then calcio‐olivine formed. Physical characterization test results demonstrated that hardnesses of new phase and particle shape were the key parameters that improved slabs’ mechanical properties of. Hard rounded larnite particles improved mechanical behavior of slabs having the synergic effect of quartz, whereas wollastonite did not show a significant effect.

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Section: Resultssupporting

confidence: 52%

Phase variation and mechanical properties of waste calcium carbonate to substitute quartz in composite slab production

Baş¹,

Güler

Özer

et al. 2023

Int J Applied Ceramic Tech

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“…Geological characterization, including a geological sketch of the area, is summarized by Lazic et al (2011). They also introduce the new mineral galuskinite Ca 7 (SiO 4 ) 3 CO 3 , which is associated with pavlovskyite.…”

Section: Occurrencementioning

confidence: 99%

Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus

Galuskin¹,

Gfeller²,

Savelyeva³

et al. 2012

American Mineralogist

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The new mineral pavlovskyite Ca 8 (SiO 4 ) 2 (Si 3 O 10 ) forms rims together with dellaite Ca 6 (Si 2 O 7 )(SiO 4 ) (OH) 2 around galuskinite Ca 7 (SiO 4 ) 3 CO 3 veins cutting calcio-olivine skarns in the Birkhin gabbro massif. In addition, skeletal pavlovskyite occurs in cuspidine zones of altered carbonate xenoliths in the ignimbrites of the Upper Chegem caldera (North Caucasus). The synthetic analog of pavlovskyite has been synthesized before and is known from cement-like materials. Isotypic to pavlovskyite is the synthetic germanate analog Ca 8 (GeO 4 ) 2 (Ge 3 O 10 ). The crystal structure of pavlovskyite, space group Pbcn, a = 5.0851(1), b = 11.4165(3), c = 28.6408(8) Å, V = 1662.71(7) Å 3 , Z = 4, has been refined from X-ray single-crystal data to R1 = 3.87%. The new colorless mineral has a Mohs hardness of 6-6.5, biaxial (-), α = 1.656(2), β = 1.658(2), γ = 1.660(2) (589 nm), 2V (meas) = 80(5)°, 2V (calc) = 89.9°, medium dispersion: r > v, optical orientation: X = b, Y = c, Z = a.For comparison with pavlovskyite, the crystal structure of kilchoanite Ca 6 (SiO 4 )(Si 3 O 10 ) from the Birkhin massif [space group I2cm, a = 11.4525(2), b = 5.0867(1), c = 21.996(3) Å, V = 1281.40(4) Å 3 , Z = 4] has been refined from single-crystal X-ray data to R1 = 2.00%.Pavlovskyite represents a 1:1 member of a polysomatic series with calcio-olivine γ-Ca 2 SiO 4 and kilchoanite Ca 6 (SiO 4 )(Si 3 O 10 ) as end-member modules. The structure is characterized by strongly folded trisilicate units (Si 3 O 10 ) interwoven with a framework of CaO 6 and CaO 8 polyhedra. Olivine-like slices with orthosilicate groups are interstratified with the characteristic trisilicate module of Ca 4 (Si 3 O 10 ) composition. Although the optical properties of pavlovskyite and kilchoanite are similar, both minerals can be distinguished by chemical analyses (different Ca/Si ratio), X-ray diffraction, and Raman spectroscopy. The new mineral is named after V.E. Pavlovsky , an outstanding geologist in the area of Eastern Siberia, in particular of the Baikal region.

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“…Only a few minerals that contain both silicate and carbonate groups exist, three of them belonging to the CaO-CO 2 -SiO 2 system: Ca 7 (SiO 4 ) 3 (CO 3 ) galuskinite 9 , Ca 5 (SiO 4 ) 2 (CO 3 ) spurrite 10 , and Ca 5 (Si 2 O 7 )(CO 3 ) 2 tilleyite 11 . They form in the metamorphic zone between limestones (sharp contact with marble, mainly composed of CaCO 3 calcite) and igneous rocks (CaSiO 3 wollastonite and other silicate minerals), at low pressures and high temperatures 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Post-tilleyite, a dense calcium silicate-carbonate phase

Santamarı́a-Pérez

Ruiz‐Fuertes

Peña-Álvarez

et al. 2019

Sci Rep

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Calcium carbonate is a relevant constituent of the Earth’s crust that is transferred into the deep Earth through the subduction process. Its chemical interaction with calcium-rich silicates at high temperatures give rise to the formation of mixed silicate-carbonate minerals, but the structural behavior of these phases under compression is not known. Here we report the existence of a dense polymorph of Ca 5 (Si 2 O 7 )(CO 3 ) 2 tilleyite above 8 GPa. We have structurally characterized the two phases at high pressures and temperatures, determined their equations of state and analyzed the evolution of the polyhedral units under compression. This has been possible thanks to the agreement between our powder and single-crystal XRD experiments, Raman spectroscopy measurements and ab-initio simulations. The presence of multiple cation sites, with variable volume and coordination number (6–9) and different polyhedral compressibilities, together with the observation of significant amounts of alumina in compositions of some natural tilleyite assemblages, suggests that post-tilleyite structure has the potential to accommodate cations with different sizes and valencies.

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Galuskinite, Ca₇(SiO₄)₃(CO₃), a new skarn mineral from the Birkhin gabbro massif, Eastern Siberia, Russia

Cited by 18 publications

References 30 publications

Phase variation and mechanical properties of waste calcium carbonate to substitute quartz in composite slab production

Phase variation and mechanical properties of waste calcium carbonate to substitute quartz in composite slab production

Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus

Post-tilleyite, a dense calcium silicate-carbonate phase

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