SiO2
Quartz Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque. [1913 Webster]

Note: The crystalline varieties include: amethyst, violet; citrine and false topaz, pale yellow; rock crystal, transparent and colorless or nearly so; rose quartz, rosecolored; smoky quartz, smoky brown. The chief crypto-crystalline varieties are: agate, a chalcedony in layers or clouded with different colors, including the onyx and sardonyx; carnelian and sard, red or flesh-colored chalcedony; chalcedony, nearly white, and waxy in luster; chrysoprase, an apple-green chalcedony; flint, hornstone, basanite, or touchstone, brown to black in color and compact in texture; heliotrope, green dotted with red; jasper, opaque, red yellow, or brown, colored by iron or ferruginous clay; prase, translucent and dull leek-green. Quartz is an essential constituent of granite, and abounds in rocks of all ages. It forms the rocks quartzite (quartz rock) and sandstone, and makes most of the sand of the seashore. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • SiO2 — Strukturformel Keine Strukturformel vorhanden Allgemeines Name Siliciumdioxid Andere Namen Siliziumoxid, Siliziumdioxid Summenformel SiO2 …   Deutsch Wikipedia

  • SiO2 — Кварц Кварцевое стекло Диоксид кремния (оксид кремния (IV), кремнезём, SiO2)  бесцветные кристаллы, tпл 1713 1728 °C, обладают высокой твёрдостью и прочностью …   Википедия

  • SiO2 — Dioxyde de silicium Dioxyde de silicium Général Nom IUPAC Dioxyde de silicium Synonymes Silice No CAS …   Wikipédia en Français

  • SiO2 — Silex Si lex, n. [L., a finit, a pebblestone.] (Min.) Silica, {SiO2} as found in nature, constituting quarz, and most sands and sandstones. See {Silica}, and {Silicic}. [1913 Webster] …   The Collaborative International Dictionary of English

  • SIO2 — Silicon Di Oxide (Academic & Science » Chemistry) …   Abbreviations dictionary

  • SiO2 — • silicon dioxide …   Maritime acronyms and abbreviations

  • Отношения молекулярные Si0 2:Al203; Si02:Fe203; SiO2:R2O3 — величины, используемые при исследовании и. Получают делением общего (валового) содержания окислов, нормированных по молекулярным их весам …   Толковый словарь по почвоведению

  • silica (SiO2) —   most common mineral component of rock …   Geography glossary

  • πυριτικό οξύ ή διοξείδιο του πυριτίου (SiO2) — Ουσία αφθονότατη στη φύση, είτε ελεύθερη είτε ενωμένη με άλλα στοιχεία, με τα οποία σχηματίζει τα πυριτικά ορυκτά. Η συνηθέστερη μορφή του π.ο. αντιπροσωπεύεται από τον χαλαζία, που εμφανίζεται σε διάφορες μορφές. Η κρυπτοκρυσταλλική μορφή του… …   Dictionary of Greek

  • Quarz (SiO2) — gesteinsbildendes Mineral, meist in Kies und Sand …   Erläuterung wichtiger Begriffe des Bauwesens

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