Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example...

model of biogenic silica, Lobel et al. (1996) identified by biochemical modeling a low-energy reaction pathway for nucleation and growth of silica. The combination...

The silica cycle is the biogeochemical cycle in which biogenic silica is transported between the Earth's systems. Silicon is considered a bioessential...

specifically N-acetylglucosamine. diatoms have a unique cell wall composed of biogenic silica. A plant cell wall was first observed and named (simply as a "wall")...

six-coordinated octahedral geometry in the mineral stishovite, a dense polymorph of silica found in the lower mantle of the Earth and also formed by shock during meteorite...

and dissolution of biogenic silica in the ocean: Revised global estimates, comparison with regional data and relationship to biogenic sedimentation". Global...

ocean waters, but still remains low enough that the reaction to form biogenic opal silica remains thermodynamically unfavorable. Despite the unfavorable conditions...

The Tournaisian limestone may contain up to 25–30 wt. % of reactive biogenic silica originating from the spicules of siliceous sponges deposited with calcium...

the formation of authigenic clay minerals from the reaction of 1) biogenic silica with aqueous cations or cation-bearing oxides or 2) cation poor precursor...

radiolaria, and siliceous sponges use biogenic silica as a structural material for their skeletons. Some plants accumulate silica in their tissues and require...

presence of biogenic silica in various species creates a large-scale marine silica cycle that circulates silica through the ocean. Silica content is therefore...

Marine biogenic calcification is the production of calcium carbonate by organisms in the global ocean. Marine biogenic calcification is the biologically...

the diatoms. These algae polymerise the silicic acid to so-called biogenic silica, used to construct their cell walls (called frustules). In the uppermost...

appetite, or soft tissue calcification.[citation needed] Calcinosis Marine biogenic calcification Monckeberg's arteriosclerosis Pineal gland Bertazzo, Sergio;...

typical chemical composition of oven-dried diatomaceous earth is 80–90% silica, with 2–4% alumina (attributed mostly to clay minerals), and 0.5–2% iron...

responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for...

evolved a form of "rebar" endoskeletons made of diffuse meshworks of calcite/silica structural elements called spicules, and echinoderms have a dermal calcite...

shells of molluscs, brachiopods, and some tube-building polychaete worms. Silica forms the exoskeleton in the microscopic diatoms and radiolaria. One mollusc...

calcite precipitation calcite sea Great Calcite Belt Silicification biogenic silica siliceous ooze diatomaceous earth Other forms Bone bed Kerogen alginite...

and siliceous sponges use biogenic silica as a structural material for their skeletons. In more advanced plants, the silica phytoliths (opal phytoliths)...

calcareous biogenic particles as they settle to the ocean bottom. The final factor is ocean fertility, which controls the amount of biogenic particles...

snails. These are not intended for human consumption. As a carbonate-rich biogenic raw material, cuttlebone has potential to be used in the production of...

defense against predators. Sponge spicules are made of calcium carbonate or silica. Large spicules visible to the naked eye are referred to as megascleres...

Biogenous sediments Calcareous ooze biogenic calcification calcareous nannoplankton Siliceous ooze biogenic silica silicification diatomaceous earth radiolarite...

simple one. A drop in solar activity circa 1230 AD as measured by biogenic silica corrected ignition residue (IR-BSi) has been suggested by one study...

a skeletal structure, made of hard material such as calcium carbonate, silica, chitin or composite materials. As such, it allows the protection of the...

communities of invertebrates and fish. Its body is primarily made of biogenic silica (>90%) which is of no nutritional value yet dorid nudibranchs (Diaulula...

or external layer of diatoms. The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance...

known example of an opal with an insect inclusion Minerals portal Biogenic silica Cacholong – variety of opalPages displaying wikidata descriptions as...

be either silicate minerals or non-silicate minerals, such as calcite. Silica cement can consist of either quartz or opal minerals. Quartz is the most...