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Page "Mineral" ¶ 39
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These and silica
These are often incompressible diatomaceous earth, or kieselguhr, which is composed primarily of silica.
These include direct industrial building-use of clays, silica sand and stone.
These minerals are primarily carbonates, sulfides, or oxides of the metal, mixed with other components such as silica and alumina.
These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic.
These ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of the opal.
These two forms of silica were first discovered by high pressure experimenters, but then found in nature at the site of a meteor impact.
These minerals are described as ‘ free ’ silica as the SiO < sub > 2 </ sub > is not attached to another element to create a new mineral.
These so-called functionalized silica gels are also used in organic synthesis and purification as insoluble reagents and scavengers.
These invertebrates are more frequently preserved because their hard parts — for example, shell, armor, plates, tests, exoskeleton, jaws or teeth -- are composed of silica ( silicon dioxide ), calcite or aragonite ( both forms of calcium carbonate ), chitin ( a protein often infused with tricalcium phosphate ), or keratin ( an even-more complex protein ), rather than the vertebrate bone ( hydroxyapatite ) or cartilage of fishes and land-dwelling tetrapods.
These skeletons are composed of opaline silica.
These flows were thicker and had a higher silica content than the Main Cone Lavas.
These include argillaceous clay, coal, dolomite, fire clay, gypsum, limestone, silica and rock salt.
These subsoil horizons can also be cemented by carbonates, gypsum or silica.
These can be so-called core-shell structures, e. g., with CdSe in the core and ZnS in the shell or from special forms of silica called ormosil.
These fakes use a variety of means to achieve the glassy green silica look as well as mild radioactivity, however, only trinitite from a nuclear explosion will contain certain neutron activation products that are not found in naturally radioactive ores and minerals.
These are made from cow manure, quartz ( silica ) and seven medicinal plants.
These deposits can range from dissolved silica to matrices formed from iron oxides and calcium carbonate.
These react with the silica in the body and other body constituents.
These improvements stem from both the mechanical improvements resulting from addition of a very fine powder to the cement paste mix as well as from the pozzolanic reactions between the silica fume and free calcium hydroxide in the paste.
These features are dependent to some extent on weathering, as the rocks contain perishable constituents which are removed and leave open cavities in their place, while at the same time additional silica may have been deposited on the quartz grains fitting their irregular surfaces more perfectly together.
These are still used by some producers, but more modern substances have also been introduced and are more widely used, including isinglass, bentonite, gelatin, casein, carrageenan, alginate, diatomaceous earth, pectinase, pectolase, PVPP ( Polyclar ), kieselsol ( colloidal silica ), copper sulfate, dried albumen, hydrated yeast, and activated carbon.
These elements are present in the living cells in which the silica concretions form, so traces are retained in the phytoliths.
These rigid silica structures help to make plants more difficult to consume and digest, lending the plant's tissues a grainy or prickly texture.
These rocks were clearly deposited in water and are composed chiefly of amorphous silica and fine detritus derived from a volcanic terrain.

These and tetrahedra
These tetrahedra can be polymerized to give the subclasses: orthosilicates ( no polymerization, thus single tetrahedra ), disilicates ( two tetrahedra bonded together ), cyclosilicates ( rings of tetrahedra ), inosilicates ( chains of tetrahedra ), phyllosilicates ( sheets of tetrahedra ), and tectosilicates ( three-dimensional network of tetrahedra ).
In addition to the tetrahedra, phyllosilicates have a sheet of octahedra ( elements in six-fold coordination by oxygen ) that balanced out the basic tetrahedra, which have a negative charge ( e. g. < sup > 4 -</ sup >) These tetrahedra ( T ) and octahedra ( O ) sheets are stacked in a variety of combinations to create phyllosilicate groups.
These forms differ in terms of the relative orientations of the constituent P < sub > 4 </ sub > tetrahedra.
These tetrahedra sometimes occur as isolated SiO < sub > 4 </ sub >< sup > 4 -</ sup > centres, but most commonly, the tetrahedra are joined together in various ways, such as pairs ( Si < sub > 2 </ sub > O < sub > 7 </ sub >< sup > 6 -</ sup >) and rings ( Si < sub > 6 </ sub > O < sub > 18 </ sub >< sup > 12 -</ sup >).

These and are
These are just another couple of characters to roll.
These men are not callous.
These things are important to almost all Persians and perhaps most important to the most ordinary.
These are traversed by another line of vaults, and thus rooms, arched on all four sides, are formed.
These songs ( practically all Persian music, for that matter ) are limited to a range of two octaves.
These are not, however, differences in federal structure.
These my grandmother left in their places ( they are still there, more persistent and longer-lived than the generations of man ) and planted others like them, that flourished without careful tending.
These are like the initial ways in which the world forces itself upon the self and thrusts the self into decision and choice.
These are suggestive of Selma Lagerlof.
These assumptions lead to an organization with one man at the top, six directly under him, six under each of these, and so on until there are six levels of personnel.
These ways are absolutely irreconcilable because they offer two different recipes for man's redemption from chaos.
These responses are explicable in terms of characteristics inherent in the crisis.
These discoveries are of present interest chiefly to the scientific community ; ;
These are personality factors ; ;
These are, if the research is done with subtlety and skill, researchable topics, but the research is missing.
These moments are historical events in the lives of individual authors with which the student of comparative literature must be frequently concerned.
These lives are in themselves outside of the moral order and are unburdened with moral responsibility.
These conceptions and the manner in which they were transposed into poetry or engendered by poetic form are intrinsic to western life from the time of Aeschylus to that of Shakespeare.
These biographical analogies are obvious, and far too much time has been spent speculating on their possible implications.
These women whose organization grew out of the old suffrage movement are dedicated to Thomas Jefferson's dictum that one must cherish the people's spirit but `` Keep alive their attention ''.
These are, of course, the same people whose support he has only now rejected to seek the independent vote.
These are New York, Pennsylvania, Michigan, Maryland, Missouri, New Jersey, Illinois and Minnesota.
These men are spenders.

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