Apatite supplies to soils almost all the phosphorus available for plants in a state of nature.
The very coarse-grained granites of Ontario contain apatite crystals of corresponding size, which have been picked out as a source of artificial phosphate manures.
Large crystals, a foot in length and mostly altered to steatite, were found in 1874 in the apatite veins traversing mica-schist and hornblende-schist at the apatite mine of Kjorrestad, near Brevig in southern Norway.
Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency.
The apatite is often filled with minute dust-like enclosures.
Defn: A variety of apatite of a greenish blue color.
Defn: A variety of apatite from Wheal Franco in Devonshire.
A variety ofapatite from Wheal Franco in Devonshire.
The pyramidal faces make different angles than those of either apatite or beryl, both of which are somewhat like quartz in crystal form.
Consequently, when we find apatite in an old granite, we know the apatite will still contain the kind of common strontium that was taken into the mica crystal when it grew originally.
Now strontium is geochemically similar to calcium, and some strontium will have gone into the apatite crystal in place of calcium.
It is justifiable, on the basis of geological knowledge, to say that the mica and the apatite grew at roughly the same time and thus presumably from the same liquid medium that became granite when it later solidified.
Apatite contains no alkalis—hence apatite will have virtually no rubidium (which is an alkali) in it to contaminate the ⁸⁷Sr.
Since the calcium phosphate of the apatite is also insoluble in ammoniacal solutions, this procedure cannot be applied directly.
The first consists of calcium phosphate along with calcium fluoride; and in other kinds of apatitethe calcium fluoride is replaced by calcium chloride.
This apatite has ceased to be imported of late years, owing to a duty on exportation.
Of apatitethere are a variety of kinds, which differ in their appearance as well as in their composition.
It occurs in very large quantities in Canada, the Canadian apatite being very rich in phosphate of lime--80 to 90 per cent.
The percentage of phosphate of lime in different kinds of apatite may be stated at from 70 to 90 per cent.
Rose, the apatite from the following localities gave the annexed proportions of chloride and fluoride of calcium, the rest being phosphate of lime with occasional traces of iron and magnesia:— S.
With regard to its mode of occurrence, apatite is found under a variety of conditions.
Another common mode of occurrence of apatite is in metamorphic crystalline rocks, especially in crystalline limestones: in eastern Canada extensive beds of apatite occur in the limestones associated with the Laurentian gneisses.
Mangan-apatite is a variety in which calcium is largely replaced by manganese (up to 10% MnO).
In this type of symmetry, of which apatite is the best example, there is only one plane of symmetry, which is perpendicular to the hexad axis.
Crystallized apatite is also occasionally found in metalliferous veins, other than those of tin, and in beds of iron ore; whilst if the massive varieties (phosphorite) be considered many other modes of occurrence might be cited.
The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon.
Apatite frequently occurs as beautifully developed crystals, sometimes a foot or more in length, belonging to that division of the hexagonal system in which there is pyramidal hemi-hedrism.
Apatite is a phosphate of lime, containing 43 per cent.
Apatite is doubtless derived from the remains of animals or fishes that lived in the distant past.
Apatite (phosphate of lime) and pyromorphite (phosphate of lead) contain a considerable amount of it.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "apatite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
