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Filter, wash, ignite, and weigh. The reaction involved is: BaSO + Na CO , > BaCO , + Na SO . As the sodium sulphate is soluble in water, and the barium carbonate insoluble, a separation between them is possible and the sulphur can be determined in the water-soluble portion. The mineral apatite is composed of calcium phosphate, associated with calcium chloride, or fluoride.
A sample of apatite weighing 0.60 gram is analyzed for its phosphoric anhydride content. !Answer!: 33.81%.
The hair of the men is worn loose; tufts of green and yellow feathers flutter over the forehead, while around their necks and dangling over their naked chests are seen strings of porcupine quills, shell beads, turquoises, bright pebbles, feldspar, apatite, anything in short that glitters and shines. Bunches of similar material glisten in their ears.
The earliest eruptions of lava in the North-east of Ireland belonged to the highly acid varieties, consisting of quartz-trachyte with tridymite. This rock rises to the surface at Tardree and Brown Dod hills and Templepatrick. It consists of a light-greyish felsitic paste enclosing grains of smoke-quartz, crystals of sanidine, plagioclase and biotite, with a little magnetite and apatite.
Both these rocks are composed of triclinic feldspar and augite with more or less olivine, magnetic or titaniferous oxide of iron, and usually a little nepheline, leucite, and apatite; basalt usually contains considerably more olivine than melaphyre, but chemically they are closely allied, although the melaphyres usually contain more silica and alumina, with less oxides of iron, lime, and magnesia, than the basalts.
Since the calcium phosphate of the apatite is also insoluble in ammoniacal solutions, this procedure cannot be applied directly. The separation of the phosphoric acid from the calcium must first be accomplished by precipitation in the form of ammonium phosphomolybdate in nitric acid solution, using ammonium molybdate as the precipitant.
Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities. There is also a small amount of hematite, pyroxene and sericite. The rock, which is of a granitic composition, contains numerous crystallites and has been subjected to considerable strain and crushing, which has resulted in foliation.
Here's some iv thim: Apatite, hog bristles, wurruks iv art more thin twinty years old, kelp, marshmallows, life boats, silk worm eggs, stilts, skeletons, turtles, an' leeches. Th' new tariff bill puts these familyar commodyties within th' reach iv all. But there's a bigger surprise waitin' for ye. What d'ye think ends th' free list? I'll give ye twinty chances an' ye'll niver guess. Blankets? No.
Of the substances likely to occur in apatite, silicic acid alone interferes with the precipitation of the phosphoric acid in nitric acid solution. PROCEDURE. Grind the mineral in an agate mortar until no grit is perceptible. The filtrate and washings must be kept as small as possible and should not exceed 100 cc. in volume.
Magnetite, Titanoferrite, and Iron-pyrites also occur as normal constituents of various igneous rocks, although in very small amount, as also Apatite, or phosphate of lime. The other salts of lime, including its carbonate or calcite, although often met with, are invariably products of secondary chemical action.
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