Large deposits of alum occur close to the village of Bulladelah, 30 m.
It is said to yield well, and a quantity of the manufactured alum is sent to Sydney for local consumption.
The modern town in the immediate neighbourhood, still known as Fokia, was founded by the Genoese in 1421 on account of the rich alum mines in the neighbourhood.
Alum and blue vitriol (sulphate of copper) are manufactured from decomposed schists at Khetri in Shaikhawati.
P. Granville put into practice between Alum Bay in the Isle of Wight and the Needles lighthouse a method which depends upon conduction through sea water.
Early in 1898 permanent stations were established between Alum Bay and Bournemouth, a distance of 142 m., where successful results were obtained.
Later the Bournemouth station was removed to Poole Harbour, and the Alum Bay station to Niton in the Isle of Wight, the distance being thus increased to 30 m.
Jager has described coprolites from the alum-slate of Gaildorf in Wurttemberg; the fish-coprolites of Burdiehouse and of Newcastle-under-Lyme are of Carboniferous age.
Other minerals found here are graphite, alum, potter's clay and roofing-slate, and, besides, famous silvermines were worked at Iglau during the middle ages.
Industries include slate quarrying, shipbuilding, iron and brass foundries, alum, vitriol, manure, guano and tobacco works.
Salts of ammonium were also known; while alum was used as a mordant in dyeing.
Many substances were employed in ancient medicine: galena was the basis of a valuable Egyptian cosmetic and drug; the arsenic sulphides, realgar and orpiment, litharge, alum, saltpetre, iron rust were also used.
Among the Arabian and later alchemists we find attempts made to collate compounds by specific properties, and it is to these writers that we are mainly indebted for such terms as "alkali," " sal," &c. The mineral acids, hydrochloric, nitric and sulphuric acids, and also aqua regia (a mixture of hydrochloric and nitric acids) were discovered, and the vitriols, alum, saltpetre, sal-ammoniac, ammonium carbonate, silver nitrate (lunar caustic) became better known.
Alum, vitriol, sulphur and nitric acid, by distillation.
For example, episomorphs of white potash alum and violet chrome alum, of white magnesium sulphate and green nickel sulphate, and of many other pairs of salts, have been obtained.
8 shows the variation of refractive index of mixed crystals of potash alum and thallium alum with variation in composition.
K A1um=z00% K Alum= o/, Tl Alum= o% Tl Alum_ zoo FIG.
In ancient times the alum of Melos was reckoned next to that of Egypt (Pliny xxxv.
The cups when full are poured into a larger vessel, and solution of alum is added to coagulate the latex.
In order to make spongy or porous rubber, some material is incorporated which will give off gas or vapour at the vulcanizing temperature, - such as carbonate of ammonia, crystallized alum, and finely ground damp sawdust.
ALUM, in chemistry, a term given to the crystallized double sulphates of the typical formula M 2 SO 4 ï¿½ MP' ï¿½(S04) 324H20, where M.
Potash alum is the common alum of commerce, although both soda alum and ammonium alum are manufactured.
The presence of sulphuric acid in potash alum was known to the alchemists.
Marggraf showed that alumina is one of the constituents of alum, but that this earth possesses peculiar properties, and is one of the ingredients in common clay (Experiences faites sur la terre de l'alun, Marggraf's Opusc. ii.
He also showed that crystals of alum cannot be obtained by dissolving alumina in sulphuric acid and evaporating the solutions, but when a solution of potash or ammonia is dropped into this liquid, it immediately deposits perfect crystals of alum (Sur la regeneration de l'alun, Marggraf's Opusc. ii.
Knowing that alum cannot be obtained in crystals without the addition of potash, he began to suspect that this alkali constituted an essential ingredient in the salt, and in 1797 he published a dissertation demonstrating that alum is a double salt, composed of sulphuric acid, alumina and potash (Annales de chimie, xxii.
Chaptal published the analysis of four different kinds of alum, namely, Roman alum, Levant alum, British alum and alum manufactured by himself.
The word alumen, which we translate alum, occurs in Pliny's Natural History.
This property seems to characterize a solution of iron sulphate in water; a solution of ordinary (potash) alum would possess no such property.
Pliny says that there is another kind of alum which the Greeks call schistos.
From the name schistos, and the mode of formation, there can be little doubt that this species was the salt which forms spontaneously on certain slaty minerals, as alum slate and bituminous shale, and which consists chiefly of the sulphates of iron and aluminium.
It has long been doubted whether sodium yielded an alum; this was settled by N.
The western promontory is flanked on the north by the picturesque Alum Bay, and the lofty detached rocks known as the Needles lie off it..
Vapours are emitted which deposit sulphur and alum, and some mining is carried on.
The output of alum averages 4000 to 5000 tons a year, and is mostly exported from Civitavecchia.
It exported iron from Elba, mosaics, pottery, manufactured locally with earth from Ischia (which was in considerable demand until 1883), sulphur (which indeed was extracted in the neighbourhood until the 18th century), probably alum (which is still worked), perfumes, pozzolana earth (taking its name from the place), cretaceous earth for mixing with grain (alica) from the Leucogaean hills, glass cups engraved with views of Puteoli, mineral dyes (the blue invented.
Besides St James and City Hall parks in the city, San Jose has Alum Rock Canyon Park, a tract of woo acres, with sixteen mineral springs, in Penitencia Canyon, 7 m.
The wells of the town are strongly impregnated with salt and alum, and in the vicinity there are several hot springs.
Salt is quarried on government account at Kalabagh and alum is largely obtained in the same neighbourhood.
It also, forms a caesium-alum Cs 2 S04-Al 2 (S04) 3 24H 2 O.
Lead and zinc are mined in much smaller quantities, alum and sulphur are also.
Its other mineral resources include graphite, copper, zinc, lead, salt, alum, potter's clay, marble and good mill and building stones.