Enter a name, company, place or keywords to search across this item. Then click "Search" (or hit Enter).
Collection: Directories and Documents > Pamphlets
Minerology Handbook by Eckert Mineral Research Prospector Supplies (PH 2-2) (28 pages)
Go to the Archive Home
Go to Thumbnail View of this Item
Go to Single Page View of this Item
Download the Page Image
Copy the Page Text to the Clipboard
Don't highlight the search terms on the Image
Show the Page Image
Show the Image Page Text
Reset View and Center Image
Zoom Out
Zoom In
Rotate Left
Rotate Right
Toggle Full Page View
Flip Image Horizontally
More Information About this Image
Get a Citation for Page or Image - Copy to the Clipboard
Go to the Previous Page (or Left Arrow key)
Go to the Next Page (or Right Arrow key)
Page: of 28
VII. BRIEF DESCRIPTION OF ROCKS and MINERALS
Actinolite—A bright or grayish green variety of amphibole containing lime, magnesium and iron, is often found in fibrous, radiated ana
columnar form. Sp. gr. 3—Hardness between 5 and 6.
Agate—A variegated chalcedony, having its colors arranged in stripes
or bands, or blended in clouds, or showing mosslike forms, etc. Fortitication agate, moss agate, clouded agate, etc., are familiar varieties.
Alabaster—A compact variety of gypsum, of fine texture, and usually white and translucent, but sometimes yellow, red or gray. It is
carved into vases, mantel ornaments, etc. A hard, compact variety of
caicite, somewhat translucent, and sometimes beautifully banded. Called
also, Oriental alabaster snd when banded, onyx marble.
Albite—Soda Spar—Hardness 6—6.5 Sp. Cr. 2.6. With substitution
of bases this spar will change to feldspar. The gem quality is moonstone. Used as imitation ivory; false teeth, etc. Fuses to a colorless
glass.
Alunite—A sulphate of potassium and aluminum, frequently found
in walls of mines and quarries: Also called feather alum, and hair salt;
occurring in crystals that look like little cubes.
Amber—A yellowish translucent resin resembling coral, found fossil
in alluvial soil with beds of lignite, and on many seashores. It takes a
fine polish, and is used for pipe mouthpieces, beads, etc., and as a basis
for a fine varnish. By friction it becomes stronlgy magnetic.
Andesine—A triclinic soda and lime feldspar, between albite and anorthite. Found in the Andes, as a mixture of andesite. It fuses readily
under the blowpipe, giving a yellow flame.
Anhydrite—Consisting of calcium sulphate. Is usually connected
with rock crystal gypsum, but does not contain water. Usually massive
and white or slightly colored, running to a gray or bluish shade. Hardness—3 to 3.5. Specific gravity—3.
Anorthite—A rare specimen occurring in many igneous rocks. However, the best species are found around the volcanic rocks of Vesuvius
and the Orient. A lime feldspar of white, grayish and reddish color.
Argentite—Silver sulphide. A valuable ore, since it contains about
85% silver. Its hardness is about 2 and it can be cut with a knife. A
mineral of metallic luster and dark lead gray color. When heated by
the blowpipe flame, the sulphur is removed and a silver ball remains.
Arsenopyrite—It is the principal ore of arsenic. The hardness is
about 6 and hard enough to be used with stee] in striking a fire. Its
color a tin white when first mined and tarnished after exposure. The
color when rubbed on the streak plate is grayish black. Arsenic is obtained by roasting the mineral. This mineral sometimes contains gold,
cobalt and nickel.
Asbestos—A kind of mineral unaffected by fire; a variety of amphibole, occurring in long and delicate fibers, or in fibrous masses or seams,
usually of a white, gray, or greenish gray color. It is used for many
=ii9=