Many of the fallen blocks show crystalline calcite markings similar to those found in the Dropping Cave.
Roof, sides, and the rocks piled on the floor, are covered by the white calcite and, in many places, present most beautiful patterns and beds of florescent formations.
The walls were dripping with moisture and rendered the limestone dead black and the veins of calcite vivid white, the whole resembling a rich glistening marble.
Marble when pure is made up of minute calcite crystals.
Calcite is a similar form, but somewhat opaque or clouded.
A mineral identical in composition with calciteor carbonate of lime, but differing from it in its crystalline form and some of its physical characters.
Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; Ð as, carbonate of lime occurs in the allomorphs calcite and aragonite.
Oh, dear; but is the calcite harder than the crystal then?
As all lamprophyres are prone to alteration by weathering a great abundance of secondary minerals is usually found in them; the principal are calcite and other carbonates, limonite, chlorite, quartz and kaolin.
The calcite seems to form in some cases a great part of the lapis; and the pyrite, which may occur in patches, is often altered to limonite.
Furthermore, the quartz gangue near the igneous rock is likely to contain minerals characteristic of hot solutions, while farther away such minerals as dolomite and calcite appear in the gangue, suggestive of cooler conditions.
Very often the gangue material is more largely calcite than quartz, whereas calcite is not present in the deep zone.
The primary ores consist of pyrite, chalcopyrite, and other sulphides, with large amounts of jaspery quartz and some calcite and dolomite.
As expressed by the French-Canadian prospector in the Cobalt district, the "vein calcite can't go up, she must go down.
Their occurrence here is in calcite veins in a bituminous limestone, but little seems to be known of their origin.
The cementing or gangue materials are chiefly calcite and quartz, in variable proportions.
Crystallization in two independent forms of the same chemical compound, as of calcium carbonate as calcite and aragonite.
Double refraction is strikingly shown by placing a piece of clear calcite (Iceland spar) over a dot on paper when two dots instead of one are visible.
Calcite is a very common mineral, especially in limestone (including chalk) and marble which are usually largely made up of it.
Certain rock formations are made up essentially of but one mineral in the form of numerous grains as, for example, limestone, which consists of calcite (carbonate of lime).
Calcium carbonate may crystallize in either of two forms, calcite or aragonite.
Small drops of water emerging from the lime rock on cave walls are evaporated and calcite and other rock minerals are deposited along these walls.
If you will notice in the cave this mineral is crystalline, and it is remarkable that as calcite crystallizes from the many individual drops of water it is arranged always in a particular pattern.
Where individual drops collect on the cave ceilings, a thin deposit may be formed on the ceiling after which the remaining water may drop to the cave floor where more calcite is deposited.
Dust and small debris have been incorporated in the crystals of calcite which form the stalagmites.
Some of the calcite concretions are a variety termed "septarian.
These concretions have calcite ridges in a honeycomb pattern throughout the rock.
Also in the Tecovas, geodes filled or lined internally with calcite crystals are found.
The pseudomorphs after olivine are quite similar to others observed in certain highly altered dolerites, they consist of calcite or calcite and viridite; they are numerous, and are generally larger than the crystals of augite or hornblende.
The calciteis in some cases pink due to manganese, a sample contained 1·20 per cent.
In the lower measures the calcite occurs in pointed scalenohedrous lining cavities in the stone.
The only product of alteration is a little calcite in the spaces between the crystals.
The massive sandstone beds of the Cedar Mesa are composed of sand grains cemented together by calcium carbonate (CaCO{3}), which also forms the mineral called calcite and the rock known as limestone.
Even rain water and snow contain small amounts absorbed from the atmosphere--enough to dissolve small amounts of limestone or of calcite cement in sandstone.
The trabeculae are united together by these thickened internodes, and the result is a fenestrated septum, which in older septa may become solid and aporose by continual deposit of calcite in the fenestrae.
The septa, radial plates of calcite reaching from the periphery nearly or quite to the centre of the coral-cup or calicle.
Calcareous sinter, a loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine.
The visceral cavity was usually filled with crystallinecalcite and all vestiges of organs obliterated.
In no case among these sections is the actual test of any appendage preserved, and the real form of each part is generally obscured by the crystallization of the calcite which fills the spaces formerly occupied by animal matter.
The "appendage" is merely the edge of a part in the head-shield; the maxilla is some calcite filling, between two such laminae.
It is readily mistaken for calcite by the miners and those unskilled in mineralogy, but a drop of acid will quickly show the difference.
The ores of calcite first mentioned are very conspicuous, they being white in the dense black rock.
Laumonite occurs in very small quantities on calcite or apopholite, and can hardly be expected to be found on the trip; but as it might be found, I will detail some of its characteristics.
They may be chipped from, as there are about thirty or forty of them exposed in each shaft, and the character of the minerals examined to see if anything but calcite is in it.
Another form of calcite which is to be sparingly found is what is called dogtooth spar, having the form shown in Fig.
Datholite is also very characteristic in appearance, and can only be confounded with some forms of calcite occurring near it.
The veins of it are difficult to distinguish from the calcite, as they are almost identical in color, and many of the calcite veins are partly of pectolite--in fact, every third or fourth vein will contain more or less of it.
Calcite by effervescing on placing a drop of acid upon it.
It occurs embedded in or incrusting the trap, and also with calcite and apopholite.
Where the most minerals occur in the chlorite is when plenty of veins of calcite are in its vicinity, and its edges near the trap are dry and crumbly.
Chemically, calcite has the same composition as the orthorhombic aragonite (q.
Although the double refraction of some other minerals is greater than that of calcite (e.
In the animal kingdom it occurs as both calcite and aragonite in the tests of the foraminifera, echinoderms, brachiopoda, and mollusca; also in the skeletons of sponges and corals.
An important property of calcite is the great ease with which it may be cleaved in three directions; the three perfect cleavages are parallel to the faces of the primitive rhombohedron, and the angle between them was determined by W.
A stalagmitic calcite of a beautiful purple colour, from Reichelsdorf in Hesse, is coloured by cobalt.
It is rhombohedral in crystallization and isomorphous with calcite and chalybite.
The cleavage is of great help in distinguishing calcite from other minerals of similar appearance.
Localities at which beautifully crystallized specimens of calcite are found are extremely numerous.
The modes of occurrence of calcite are very varied.
Calcite is also remarkable for the variety and perfection of its twinned crystals.
Only very occasionally has calcite from any locality other than Iceland been used for the construction of a Nicol's prism.
In the form of stalactites calcite is of extremely common occurrence.
In addition to the varieties of calcite noted above, some others, depending on the state of aggregation of the material, are distinguished.
Mohs) Formed mainly of calcite (calcium carbonate) or conchiolin, a horny organic substance Specific gravity: 2.
Mohs) A rock composed mainly of the mineral lazurite with variable amounts of pyrite (brassy flecks) and white calcite Specific gravity: 2.
Well-formed crystals of clearcalcite have been found in many of the geodes from the Tecovas.
A dull, earthy calcite deposit, caliche typically forms in areas of scant rainfall.
Planes or crystal ghosts, sometimes with pyrite crystals, marking stages of growth in the calcite crystals, are often distinguishable.
The Glacier flows between two high walls of dark rock, and the steep incline of perhaps seventy feet, covered with a smooth deposit of calcite and shining with moisture, has the appearance of ice and is as uninviting for a climb.
This calcium carbonate was slowly deposited in crystalline form, so that in time the cracks were filled and the crushed rock firmly cemented with calcite seams.
In all cases the original box work has been in thin sheets of calcite, and the heavy varieties are due to later deposits of calcite and aragonite crystals or, pop corn.
This chamber proved to be a little gem; small but high, and beautifully adorned with calcite crystal.
A number of more or less parallel fine cracks, filled with calcite and traversing also the inclosed crystals of plagioclase, together with small fragments of basic rocks are displayed in the section.
They then present alternating layers of calcite and viridite and are often bordered by magnetite.
No organic remains appear to exist; whilst the scanty calcite present is evidently an alteration product.
The matrix is made up of fine detritus of the large fragments and of lapilli of a vacuolar palagonitic basic glass, whilst small crystals of calcite fill the cavities and line the fissures.
The tests of the foraminifera are sometimes filled with the matrix, but often they are entirely of calcite and exhibit in polarised light a dark cross.
Secondary calcite occurs in the groundmass, and the powdered rock effervesces a little in an acid.
At times they are scoriaceous and display amygdules ofcalcite or a zeolite.
At the point the rock is somewhat scoriaceous, with calcite occasionally filling the cavities, whilst the olivine is so thoroughly hæmatised that it glistens like brown mica.
The tests of the foraminifera remain calcitic; but their cavities are filled either with the matrix or with calcite or with a colourless fibro-radiate mineral polarising in blackish-blue hues.
It shows secondary calcite and viridite and other evidences of the propylitic change.
Fine cracks, filled with calcite and a zeolite, traverse this rock in all directions, and no doubt this peculiar structure arises from shrinkage.
Secondary calcitealso occurs here and in the chloritic pseudomorphs.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "calcite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
