Up to 1860 the methods of procuring amber were largely confined to obtaining it in the manner above noted. As it was evident however that the sea amber came from strata underneath and that if either by dredging or mining these strata could be reached a much larger supply could be obtained, exploration was carried on by mining methods with successful results, and the principal amount of the amber of commerce is now so obtained. The strata as shown in the mines of Samland, the rectangular peninsula of East Prussia where most of the mining is carried on, are: First, a bed of sand; below this a layer of lignite with sand and clay, and following this a stratum of greensand, fifty or sixty feet in thickness. While all these strata contain scattered pieces of amber, it is at the bottom of the greensand layer that the amber chiefly occurs, in a stratum four or five feet thick and of very dark color. It is called the “blue earth.” This stratum is of Tertiary age and there can be no doubt that its amber represents gum fallen from pines which grew at this period and whose woody remains are represented to some extent in the layer of lignite. It is probably true as Zaddach remarks that the amber has been collected here from older deposits. One of the most interesting proofs of the vegetable origin of amber is the occurrence in it of insects, sometimes with a leg or wing separated a little distance from the body, showing that it had struggled to escape. These insects include spiders, flies, ants and beetles, while the feather of a bird has even been found thus preserved. Indeed the amber deposits have furnished important contributions to our knowledge of Tertiary life. Inasmuch as the pieces bearing such remains are valued more highly than ordinary amber, unscrupulous persons have at times found profitable employment in boring cavities into pieces of amber, introducing flies or lizards into them and then filling up the hole with some modern gum of the same color. It is said that all amphibious or water animals seen in amber have been introduced in this way.
Besides the counterfeiting of the inclusions of amber there are several substitutes for the gum itself. These are chiefly celluloid and glass, the substitution of the former being dangerous if used for the embellishment of pipes, on account of its inflammatory character. Celluloid can be distinguished from amber by the fact that when rubbed it does not become electric and gives off an odor of camphor instead of the somewhat aromatic one of amber. It is also quickly attacked by alcohol or ether, and when scraped with a knife gives a shaving rather than a powder as amber does. Glass can be distinguished by its cold feeling and greater specific gravity.
Besides these substitutes it has been found possible by heating and pressing the scraps of amber not large enough for carving to make them into a homogeneous mass which is sometimes sold as amber and sometimes as amberoid. Amber is worked to desired shapes by turning it on lathes or by cutting by hand. By heating it in linseed oil it becomes soft so that it can be bent and often all opaque spots can be made to disappear by such treatment. The amber which is most highly prized of any in the world comes from Sicily. Eight hundred dollars have been paid for pieces of this no larger than walnuts, making their value nearly equal to that of diamonds. The beauty of the Sicilian amber consists in the variety of colors which it displays, blood red and chrysolite green being not uncommon, and the fact that these often exhibit a brilliant fluorescence, glowing within with a light of different color from the exterior. Chemically the Sicilian amber is not the same as the Prussian as it contains less succinic acid and is somewhat more soluble. In other respects it is not essentially different. It occurs chiefly on the eastern and southeastern coasts being washed up in a manner very similar to the Prussian amber.
Amber has been found in several places in the United States, but there is little of commercial value. It is mostly connected with the Cretaceous glauconitic or green sand deposits of New Jersey, fragments being frequently found there. This amber is of yellow color but not so compact or lustrous as foreign amber. Amber has also been reported from the marls of North Carolina, some of the coal beds of Wyoming and in connection with lignite in Alaska. In the latter region the natives are said to carve it into rude beads.
Amber occurs in small quantities in several countries of Europe, such as near Basel in Switzerland, near Paris in France, and near London in England. It is also found in many parts of Asia, these localities being a source of supply to the Asiatic countries such as China and India. Occasionally amber is obtained from Mexico which has the beautiful fluorescence of the Sicilian article, though the exact locality whence it comes is not known. Specimens of carved amber are found among the relics of the Aztecs and it is probable that they used it for incense. The early use of amber by European peoples has already been referred to. There are references to it in the most ancient literature and worked masses of it are found among human relics of the greatest antiquity. Up to comparatively modern times it was an important article of commerce among widely scattered peoples and had much to do with bringing about communication between them. Together with tin it was one of the chief objects which led the Romans to penetrate the Gallic regions to the west and north of the Mediterranean and Pliny says that “it had been so highly valued as an object of luxury that a very diminutive human effigy made of amber had been known to sell at a higher price than living men, even in stout and vigorous health.” One of the most elaborate of the Greek myths is that which accounts for the origin of amber. It runs in this wise:—Phaethon, undertaking to drive the chariot of his sun god father, Helios, lost control of his steeds and approaching too near the earth set it on fire. Jupiter to stop him launched a thunder-bolt at Phaethon and he fell dead into the Eridanus. His sisters lamenting his death were changed into poplars and their tears became amber.
In the Odyssey one of Penelope’s admirers gives her an amber necklace, and Martial compares the fragrance of amber to the fragrance of a kiss. Milton writes of amber and Shakespeare mentions it both in “Love’s Labor Lost” and “The Taming of the Shrew.”
Necklaces of amber are popular wedding presents among the peasants of Prussia and they form an important feature of the ornaments worn by many African chiefs.
The properties assigned to amber both as a charm and as a medicine have been many. From the earliest times it has been used as an amulet, being supposed to bring good luck and to protect the wearer against the evil eye of an enemy. Necklaces of amber beads are used to this day as preventive or curative of sore throat and the Shah of Persia wears around his neck a cube of amber reported to have fallen from heaven in the time of Mohammed, which is supposed to have the power of rendering its wearer invulnerable. Amber was also taken internally in former times as a cure for asthma, dropsy, toothache and other diseases and to this day is prescribed by physicians in France, Germany and Italy for different ailments.
The use of amber for artistic and decorative purposes has declined considerably since the Middle Ages, but magnificent illustrations of its employment for these purposes are to be seen in many European museums, notably the Green Vaults of Dresden.
Though so soft and easily destructible a substance it endures with ordinary care as well as the hardest stone, and works of art formed from amber are as well preserved as any to be found.