They are micaceous strata; and thus the true cipollino is a mixture of talcose schist with white saccharoidal marble, and may be said to form a transition link between marble and common stone.
In this group calc-spar or dolomite wholly replaces the quartz and films of argillaceous matter, of which, especially in Scotland, micaceous schist is usually composed.
Towards the east the surface of the country rises gradually, and the sandstone, without giving place to any other stratum, becomes more micaceous and slaty, and at length assumes all the characters of a sandstone accompanying coal.
The surface of the sandy plain rises perceptibly towards the base of the mountains; and becoming constantly more and more undulating, is at length broken, disclosing some cliffs and ledges of micaceous {280} sandstone.
The internal temperature of this mass was very high; the hydrochloric acid which it discharged had, in some places, covered the micaceous iron with a yellow coating of chloride of iron.
In the greater number of cases the interior of these masses is formed of leucitic lava, with cavities lined with micaceous iron.
Sometimes one collects micaceous peroxide of iron on the lava, but it is often transported there from the mouths of eruption, as happened on this occasion.
That micaceous peroxide of iron--so common and abundant near the eruptive mouths--is very scarce and rare on the lavas, unless conveyed there from the craters.
Among the oxides, we must enumerate in the first place "tenorite" and feroligiste or micaceousperoxide of iron.
Micaceous peroxide of iron, when found on the lava, has been mostly conveyed from the eruptive mouths, as I have already stated, and perhaps never so abundantly and evidently as on this occasion.
Smoke and hydrochloric acid issued from the aperture in its envelope, and being partly broken it was seen to contain lapilli and pieces of antecedent lava, covered with micaceous peroxide of iron.
Granting that this theory might be applicable to the origin ofmicaceous iron, we should still want to know how it is found with the paste of the new lava itself, which forms the exterior coating of the bombs above described.
Looking, however, at the wide range of the species and the comparatively limited area in which micaceous rocks occur, this seems a rather improbable explanation, and the occurrence of this metallic appearance is still a difficulty.
The strata on both sides had the same inclination, and were decidedly primary, consisting of the ordinary micaceous schistus.
The rock which stands in competition with granite for the title of primitive in the order of mountains, is thatmicaceous stratified stone which is formed chiefly of quartz, but which admits of great variety like the granite.
Its general character, however, is micaceous slate, with broad veins of quartz; the latter being particularly conspicuous at Port Gallant.
The shining substance proved to be, as I had supposed, the micaceous particles of disintegrated granite.
When mica or felspar occurs plentifully, we have, in the one case, micaceous sandstone, and in the other felspathic sandstone.
Thus, highly micaceous sandstones, as they are traced into a metamorphic region, are seen to pass gradually into mica-schist.
Before sleeping, I despatched to El-Wijh two boxes of micaceous schist and two bags of quartz, loads for a pair of camels.
The material worked was evidently the pink-coloured and silver-scaled micaceous schist; but there was also a whitish quartz, rich in geodes and veinlets of dark-brown and black dust.
Free gold in paillettes was noticed by the Expedition in the micaceous schists veining the quartz, and in the chalcedony which parts the granite from the gneiss.
Here and there mounds of the rosy micaceous schist, still unworked, looked as if it had been washed out by the showers of ages.
Defn: A mineral occurring in emerald-green tabular crystals having a micaceous structure.
Defn: A group of minerals having, a micaceous structure.
We entered one of them, which was in extent little short of two acres; the argillaceous schistus, which formed the upper stratum, appeared in a variety of stages, the greater part migrating into micaceous schistus.
One hillock near the road exhibited perpendicular laminæ of micaceous grit, which, on alighting from my horse and examining, I found to be flexible.
One part of the estate is an auriferous mountain of schistus, containing beds of micaceous iron ore; the latter substance forms a thin stratum, which contains gold in grains laminated with it.
I took one of their instruments, and on using it as they did, found these veins to contain a very minute micaceous substance approaching to earthy talc, also some quartz, and large crystals of specular iron ore.
In riding over it in various directions, I observed it to be composed of argillaceous schistus in almost every gradation, migrating from the compact blue slate into micaceous schistus.
Red arenaceous beds of great thickness alternate with grayish-colored bands, composed of a ripple-marked micaceous slate and a stratified clay.
Here the unctuous chlorite constructed its soft felt; there the micaceous schist arranged its undulating layers; yonder the dull clay hardened amid the intense heat, but, when all else was changing, retained its structure unchanged.
Murchison, in 1843, is a micaceous iron-stained quartz, of but little beauty.
An important character is the perfect micaceouscleavage parallel to the basal plane, on which plane the lustre is pearly.
Tvedestrand in south Norway, and is a variety of oligoclase enclosing micaceous scales of haematite.
The more micaceous varieties form transitions to granulite and gneiss.
Micaceous iron ore consists of delicate steel-grey scales of specular haematite, unctuous to the touch, used as a lubricant and also as a pigment.
Tierra amarilla, or yellow micaceous clay, of which the Rio Grande Indians make many varieties of vessels.
But few specimens of the purely micaceous ware are found, either in Zuñi or Wolpi.
The following numbers are specimens of statuettes, of micaceous clay, representing human beings in various attitudes, both male and female.
Coal slate, full of sulphur mixed withmicaceous stones:--at Portrain.
Cotton Manufactory; and the mineralogist may examine the veins of sparry micaceous stone, of copper, and sulphur, recently discovered.
If it were thoroughly well crystallized, you would see none of those micaceous fractures; and the stone would be quite red and clear, all through.
It is rust of iron, finely crystallized: from its resemblance to mica, it is often called micaceous iron.
It crystallises in brilliant micaceous lamina, soluble in their own weight of cold water, and somewhat more soluble in boiling water.
The micaceous iron ore found in small quantities in Wales and Lancashire has nearly the same composition, but crystallises in brilliant plates.
The clay appeared everywhere extremely fine, without any intermixture of sand or micaceous grains.
At intervals there was a good deal of alluvium, partly in the shape of coarse conglomerate, partly a fine micaceous sand, filling up the recesses at the bends of the ravine.
These are few and simple and chiefly of the yellow micaceous ware, some of it blackened by use so that the original color cannot now be observed.
There were also many minute flakes of a micaceous slate, the points of which were rounded.
In my own collection there are specimens of micaceous slate from the same region, with indications on their weathered surfaces of similar rounded perforations, having the aspect of Scolithus, or of worm-burrows.
Admitting the interpretation given of these to be correct, they are no more related to Eozoon than are the curious vermicular crystals of a micaceous mineral which I have noticed in the Canadian limestones.
Bluish and grayish micaceous slate, interstratified with layers of gneiss, and occasionally holding crystals of magnetite.
Special interest attaches to the discovery by Mr. Vennor of specimens of Eozoon contained in a dark micaceous limestone at Tudor, in Ontario, and really as little metamorphosed as many Silurian fossils.
The lowest zone is the Hollybush Sandstone, a light green micaceous rock, containing tubes of sea worms and Kutorgina cingulata.
The beds referred to the Rhætic include a stratum of yellow micaceous sandstone full of Schizodus cloacinus, which, though usually in the form of casts, is sharp and well defined.
In Swinyards Hill there is a micaceous gneiss with garnets, and in Raggedstone Hill there are interesting varieties of contorted mica-schist containing a large proportion of quartz.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "micaceous" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: mineral; petrified; sulfurous
