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Collection: Directories and Documents > Pamphlets
Minerology Handbook by Eckert Mineral Research Prospector Supplies (PH 2-2) (28 pages)
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Page: of 28
attracted by a magnet, and one variety, lodestone, is a powerful magnet itself. It has a north and south pole, the property of pickIng up
particles of iron and steel, and when suspended, it sets with its poles
north and south like a compass needle. Luster—metallic; Color and
Streak—black; H-6 Sp. gr. 5.18
Malachite—Green basic carbonate of copper, is a bright green mineral, often found with native copper—cuprites and other copper ores.
The compact variety is used for table tops, etc. Also called green malachite, to distinguish it from blue malachite or azurite.
Manganest—Manganese and Oxygen, Pyrolusite and Psilomelane,
with some Iron Oxide—Its deposition is similar to that of iron, with
this difference—it has a stouter affinity for oxygen, hence its value as
@ flux in steel—a “scavenger.”
It is common in nature, coating rocks and boulders in streams. A
deep black.
Manganese and iron are dissclved out of the rocks by the same
reagents at the same time and in the same way. However, as shown
by the specimen, the ores are thrown down separately. It is the resuit
of decomposition of rocks.
The mineral is much sought after, with a careful check on its possible impurities.
Uses — In producing harder steel and as a dsoxidizing agency.
Chiefly in the Bessemer process—in the making of steel rails, shovel
points, etc., in dry batteries. color glass, flint glass and pottery.
Marble—Any limestone, granular to compact in texture, capable of
taking a polish or of being used for fine architectural work and ornamental purposes. Marble (proper) differs from common limestone in
being more or less crystullized by metamorphism. The purest form is
statuary marble, white and finely crystalline, as the famous Parien,
Pantelic, and Carrara marbles. Other varieties vary from white to black,
being sometimes yellow, red, green, etc., according to the nature of the
admixed matter often showing beautifully veined and clouded effects.
Marcasite—White Iron Pyrites—Hardness 6—6.5. Sp. Gr. 4.6—4.8.
Color—pale brass yellow to steel gray, darker after exposure. Different
from pyrite in that when powdered it dissolves in concentrated nitric
acid, with separation of sulphur. Crystals are tabular or short columnar. It is not found in igneous rocks; is common in sedimentary formations and metalliferous veins.
Micaceous Iron Ore—Hematite, having a micaccous structure (micaceous meaning consisting of, or containing, mica) resembling mica in
foliation or luster.
Mica—A group of minerals crystallized in form, and characterized
highly perfect cleavage, so that they readily separate into very thin
leaves, more or less elastic. They are all silicates, but differ widely in
composition, and vary in color from colorless, pale brown, or yellow, to
green or black. The transparent forms are used in lanterns, the doors
of stoves, etc, being popularly called isinglass. The mica division includes the micas proper, the brittle micas and the chlorites. Mica is
the prominent constituent of many igneous and metamorphic rocks.
—19—4