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Book IV Sulphur, amber, Pliny's gems, jet, bitumen, naphtha, camphor, maltha, Samothracian gem, thracius stone, obsidianus stone
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BOOK IV
81
partly because it is arborescent. Because of its arborescent form, it has also been called
dendrites.
Actually the coral itself can be seen as a soft green bush growing under the sea. It has berries which are similar in appearance and size to those of the cornel tree. They are soft and white and when left in the air they soon harden as cleverly described by Ovid,
"In this way coral, when first it touches air, In time it hardens, soft was the plant under the waves."
Since it begins to harden as soon as it is exposed to the air it has been named
gorgonia.
The poets picture the Gorgones as turning people into stone. Pliny writes thus concerning gems,
"gorgonia
is nothing other than coral, the reason for the name being because it is changed into the hardness of stone." The Persians, according to Pliny, call it
jaces.
Coral is not of one color nor are the other stones of this genus that have congealed within the earth from a juice. If the juice was red the coral is red; if reddish, reddish; if white, white; if black, black; and if greenish, greenish.However, as I have said previously, all coral before it is torn away with nets or broken off with pieces of iron is green. When a single stone forms from juices of different colors it has several colors and for this reason the stalk and branches of a single coral may be red, white, black and other colors, Black coral has been named
antipathes
by some, according to Dioscorides and by others
isidis plocamos,
according to Juba. Coral has a moderately astringent taste and an odor very similar to algae. Some is hard, such as that from Gaul, some soft such as that from Terra di Lavoro, while that from Erythra is even softer. All coral will break when it falls. Some is solid, some tube-like, some scaly, some with many branches and some with only a few.
Coral occurs in many places. It is found around the Orkneys north of the British Isles, in the Hetruscus Gulf near Gravisca, at Terra di Lavoro near Naples, in Sicily near Helia and Trapani, in Africa near Erythra, in the Persian Gulf. Black coral occurs in the Red Sea around the islands of the Troglodytae.
We wear the perforated berries of coral as ornaments and use them in calculating prices as do the Indians. Pliny writes that the Indian prophets and priests, being especially superstituous, believe that when they are worn as an amulet they have the power to ward off danger and hence the people take a decorous and religious pleasure in wearing them. Unless it is a coral berry I do not know what the mineral might be that Pliny calls a gem nor whom he has followed when he writes that it has the appearance of a cherry. The common people believe that if young sprouts of coral are worn suspended from the neck they will protect infants and children from being bewitched. The people of Gaul decorate their swords, shields and helmets with it. As a remedy it dries and cools and is astringent. For that reason, having been drunk in water, it stops the coughing of blood and cures severe cases of colic. Physicians select
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Agricola. Textbook of Mineralogy.
Front page, forword and index
To the illustrious duke of saxony and thuringia and misena prince of Maurice
Book I Minerals color, taste, odor , physical properties of gemstones and minerals such as emeralds, diamonds, rubies, sapphires
Book II About different applications of earths (painting, medical) and their occurrences
Book III about halite and nitrium, alum and acrid juices and related minerals, sulphur, bitumen, realgar, and orpiment; the fourth, chrysocolla, aerugo, caeruleum, ferrugo
Book IV Sulphur, amber, Pliny's gems, jet, bitumen, naphtha, camphor, maltha, Samothracian gem, thracius stone, obsidianus stone
Book V about lodestone, hematite, geodes, hematite, selenite, lapis secularum, asbestos, mica
Book VI gems: diamond, emeralds, sapphire, topaz, chrysoberyl, carbuncle, jaspis
Book VII marbles, gems in rings and other applications
Book VIII metals, precious such as gold, platinum, silver
Book IX artificially coloring of metals such as gold, silver, copper
Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth
Latin Mineral Index
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