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Microcrystalline varieties of silica also include small grains of this material, possibly combined with amorphous silica. Other than alpha quartz, all of these forms are thermodynamically metastable at earth surface temperatures and pressures and will slowly convert to alpha quartz given enough time (millions of years). Coesite and stishovite are two rare polymorphs formed at high pressure (e.g., meteorite impact craters and some ultra-high-pressure metamorphic rocks). Tridymite and cristobalite are other fairly common forms of crystalline silica and are generally found in rocks formed at high temperature (e.g., volcanic rocks). Exceptions to the generally widespread occurrence of quartz are the highly weathered soils of tropical regions, where even the resistant quartz has been lost through weathering processes. Quartz is so prevalent that the term quartz is often used in place of crystalline silica.
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That quartz is among the most abundant minerals in many, if not most, soils is a reflection of its chemical stability and resistance to weathering. Alpha quartz is the most common form, and is found in large quantities in many rocks and soils worldwide. Quartz is present as alpha and beta (high temperature) forms. Quartz is the most common crystalline form of silica encountered in nature. Pinkerton, in Encyclopedia of Toxicology (Third Edition), 2014 Uses and Occurrence in Nature
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The presence of silica, extensive fibrosis, scarcity of mitotic figures, and poorly developed vasculature all serve to distinguish these lesions from fibrous histiocytomas and undifferentiated pleomorphic sarcomas. The collagen varies from delicate interstitial or perivascular fibers in the early stages to broad bands and finally mats or large nodules. A striking feature of the lesion is the large amount of fibrosis. Numerous silica crystals can be identified under polarized light. PAS-positive, diastase-resistant bodies may be present in the histiocytes and probably represent large phagolysosomes, organelles involved in the intracellular storage of silica. Although usually well differentiated, the histiocytes occasionally display moderate pleomorphism. They consist of sheets of histiocytes with a clear or amphophilic cytoplasm. Grossly, the lesions are poorly defined, gray-yellow masses with a gritty consistency on cutting. Typically, they occur many years after the injection of silica, so the causal relation of the injection is minimized or overlooked. 158 Clinically, these lesions present as slowly enlarging tumorous masses, usually in the inguinal region or abdominal wall. It seems principally to be an iatrogenic disease secondary to the now-obsolete injection therapy for hernias. Goldblum MD, in Enzinger and Weiss's Soft Tissue Tumors, 2020 Silica ReactionĪlthough the usual response to silica in soft tissue is a localized foreign body reaction, exuberant reactions to the material simulate a fibrohistiocytic neoplasm ( Figs. Note: Glyphicons are not supported in Bootstrap 4.įor more information about Bootstrap 3 and Glyphicons, visit our Bootstrap 3 Tutorial.John R. Google Google Icons Intro Icons Action Icons Alert Icons AV Icons Communication Icons Content Icons Device Icons Editor Icons File Icons Hardware Icons Image Icons Maps Icons Navigation Icons Notification Icons Places Icons Social Icons Toggleīelow is a list of all Bootstrap 3 Glyphicons.
#ONYX 3.1.2 ICON CODE#
Icons Tutorial Icons HOME Icons Referenceįont Awesome 5 Font Awesome 5 Intro Icons Accessibility Icons Alert Icons Animals Icons Arrows Icons Audio & Video Icons Automotive Icons Autumn Icons Beverage Icons Brands Icons Buildings Icons Business Icons Camping Icons Charity Icons Chat Icons Chess Icons Childhood Icons Clothing Icons Code Icons Communication Icons Computers Icons Construction Icons Currency Icons Date & Time Icons Design Icons Editors Icons Education Icons Emoji Icons Energy Icons Files Icons Finance Icons Fitness Icons Food Icons Fruits & Vegetables Icons Games Icons Genders Icons Halloween Icons Hands Icons Health Icons Holiday Icons Hotel Icons Household Icons Images Icons Interfaces Icons Logistics Icons Maps Icons Maritime Icons Marketing Icons Mathematics Icons Medical Icons Moving Icons Music Icons Objects Icons Payment & Shopping Icons Pharmacy Icons Political Icons Religion Icons Science Icons Science Fiction Icons Security Icons Shapes Icons Shopping Icons Social Icons Spinners Icons Sports Icons Spring Icons Status Icons Summer Icons Tabletop Gaming Icons Toggle Icons Travel Icons Users & People Icons Vehicles Icons Weather Icons Winter Icons Writingįont Awesome 4 Font Awesome Intro Icons Brand Icons Chart Icons Currency Icons Directional Icons File Type Icons Form Icons Gender Icons Hand Icons Medical Icons Payment Icons Spinner Icons Text Icons Transportation Icons Video Icons Web Application