Mineralogy and mineral chemistry of quartz: A review

Götze, Jens; Pan, Yuanming; Müller, Axel

doi:10.1180/mgm.2021.72

Cited by 70 publications

(40 citation statements)

References 235 publications

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“…It is interesting to note that the small but statistically significant variations between the white and blue areas concern only ions that do not cause significant colouration in quartz. In fact, among all the elements identified, possible sources of greyish and bluish tints in the quartz can be traced back to Al, Ti, and Fe ions (Götze et al 2021;Rossman 2018;Seifert et al 2011). Moreover, although the iron content is quite low, it is high enough to induce violet colouration in amethyst quartz (Barry et al 1965;Czaja et al 2017;Dennen and Puckett 1972).…”

Section: Sample Description Crystallographic Phases and Compositionmentioning

confidence: 99%

Atomic and microstructural origin of banded colours in purple-blue variety of agate from Yozgat Province, Turkey

et al. 2022

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Agates from Yozgat province are appreciated on the gem market for their white and purple-blue banded colours. In this study, we present a detailed investigation aimed at the identification of the atomic and structural origin of this peculiar colouration of chalcedony. X-ray diffraction and Raman spectroscopy revealed the presence of fine grains of quartz and moganite with a preferential accumulation of the latter in the blue bands. Near-infrared diffuse absorption spectra show overtones of hydroxyls vibrations at 1425, 1900, and 2250 nm. In the visible, the broad absorption at about 500 nm, as well as its behaviour at low temperatures, is compatible with the optical activity of iron impurities in quartz matrices, such as that observed in amethysts. Peak intensities and shapes are very similar for spectra collected in blue and white bands. Accordingly, trace-element composition from laser ablation inductively coupled mass spectrometry confirmed that the two regions have similar Fe content. The perceived changes in band colours are indeed originated by differences in microstructural arrangement and size of the grains visualised through scanning electron microscopy. White and blue stripes have grains of about 5 µm and 300 nm in size, respectively, resulting in an accentuated scattering component for the white bands. Therefore, the unique purple-blue shades typical of Yozgat agates are a combination of iron-related colour centres and scattering effect.

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Section: Sample Description Crystallographic Phases and Compositionmentioning

confidence: 99%

Atomic and microstructural origin of banded colours in purple-blue variety of agate from Yozgat Province, Turkey

et al. 2022

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“…Quartz is one of the most ubiquitous rock-forming minerals in the earth crust and can form various rocks in different geological environments [1,2], including hydrothermal (e.g., quartz vein, pegmatite), sedimentary (e.g., sandstone, chert), and metamorphic (e.g., quartzite) settings. High purity quartz (HPQ) is an essential material for high-tech applications, especially semiconductor, solar panel, and optic fibers to name a few [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…In their effort, the elemental concentration limits of HPQ were constrained at: Al < 30 µg g −1 , Ti < 10 µg g −1 , Na < 8 µg g −1 , K < 8 µg g −1 , Li < 5 µg g −1 , Ca < 5 µg g −1 , Fe < 3 µg g −1 , P < 2 µg g −1 and B < 1 µg g −1 , whereby the sum of all elements should not exceed 50 µg g −1 . The refined HPQ definition was adopted by scientific communities [2,18,19].…”

Section: Introductionmentioning

confidence: 99%

“…In situ techniques such as laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), electron microprobe (EPMA), and secondary ion mass spectrometry (SIMS) applied to quartz have advantages in determining the lattice-bound element contents [11,19,20,[23][24][25][26]. Other methods used to characterize chemical composition of quartz include bulk chemical analysis by solution ICP-OES/MS, scanning electron microscopecathodoluminescence (SEM-CL), and electron spin resonance [2,23,[27][28][29]. Bulk chemical analysis by solution ICP-OES/MS is generally used to detect trace elements concentration for quartz [4,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Trace Element Concentrations and Mineralogy of Quartz Vein Deposits from Southeastern Hubei Province, China

et al. 2022

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Hydrothermal quartz samples collected from the Fujiashan and Yipanqiu quartz deposits in southeastern Hubei Province, China have been investigated by analytical combination of optical microscopy, scanning electron microscopy, and inductively coupled plasma optical emission spectroscopy, in conjunction with conventional beneficiation processing to evaluate their potential as sources of high purity quartz (HPQ) from a commercial perspective. Microscopy efforts reveal that major mineral impurities associated with quartz are K-feldspar, muscovite, iron oxides, rutile with accessory kaolinite. Bulk trace element concentrations of the processed quartz products demonstrate that the Fujiashan-II quartz vein with cumulative impurities of less than 50 μg g−1 with <30 μg g−1 Al and <10 μg g−1 Ti fits with the lattice-bound criteria for HPQ, meeting the requirement by a HPQ deposit. However, the Yipanqiu quartz deposits are not promising for HPQ production due to high fluid inclusion contents, intimate intergrowth texture with highly variable crystal size, and probably high lattice-bound element contents. The early Neoproterozoic Fujiashan quartz deposits have likely been experienced long-term retrograde metamorphism-related recrystallisation which might contribute to high-purity quartz formation. Due to a much younger crystallization age compared to the Fujiashan deposits, quartz grains in the middle Cretaceous Yipanqiu quartz vein retain high trace elements, leading to exclusion of being a HPQ deposit.

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“…Crystallized quartz can form in soil solution from soluble SiOH 4 by polymerization, precipitation of amorphous, hydrous SiO 2 , and slow transition into crystalline quartz. [12][13][14] Both QRZ and FLS mineral has a range of physical qualities and has a considerable influence on the reinforcing of polymer properties mainly mechanical, thermal, and resistance to UV radiation which makes them of interest to material researchers. Research efforts related to the use of FLS and QRZ as mineral additives for polymer composites were reported by several research studies in which different types of characterizations were carried out.…”

mentioning

confidence: 99%

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

Bouzmane

Tirkes

Yılmaz

et al. 2022

Vinyl Additive Technology

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In this study, quartz and feldspar powders were surface treated using a silane coupling agent to achieve a more compatible mineral surface with the polymer matrix. Details of surface characteristics of minerals were examined by energydissipative X-ray spectroscopy, contact angle measurements, and infrared spectroscopy. Thermoplastic polyurethane-TPU was compounded with minerals using the melt-blending technique. Mechanical, thermo-mechanical, meltflow, and morphological characterizations of TPU and relevant composites were performed by utilizing tensile and Shore hardness tests, dynamic mechanical analysis (DMA), melt flow index (MFI) measurements, and scanning electron microscopy (SEM), respectively. Water repellency of TPU and composites were also evaluated experimentally. Effects of surface treatments were discussed by comparing the results of composites filled with pristine and modified minerals. Results revealed that enrichment of quartz and feldspar surfaces confer mechanical and thermo-mechanical performance of composites. Mineral inclusions caused no drastic changes to the MFI parameter of TPU. The silane layer on the mineral surface displayed a barrier effect to water uptake of composites. Homogeneous dispersion and improved interfacial adhesion of mineral particles to the TPU phase were confirmed with help of SEM observations. Quartz exhibited slightly higher performance thanks to its silicarich composition. The findings of this research exhibited the considerable influence of the silane layer on the mineral surface on the mechanical performance of TPU-based composites.

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Mineralogy and mineral chemistry of quartz: A review

Abstract: This is a 'preproof' accepted article for Mineralogical Magazine. This version may be subject to change during the production process.

Cited by 70 publications

References 235 publications

Atomic and microstructural origin of banded colours in purple-blue variety of agate from Yozgat Province, Turkey

Atomic and microstructural origin of banded colours in purple-blue variety of agate from Yozgat Province, Turkey

Trace Element Concentrations and Mineralogy of Quartz Vein Deposits from Southeastern Hubei Province, China

Contribution of surface silanization process on mechanical characteristics of TPU‐based composites involving feldspar and quartz minerals

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