Search Nevada County Historical Archive
Enter a name, company, place or keywords to search across this item. Then click "Search" (or hit Enter).
To search for an exact phrase, use "double quotes", but only after trying without quotes. To exclude results with a specific word, add dash before the word. Example: -Word.

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
Share this Page - Copy to the Clipboard
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  
Go
Loading...
EXPERIMENT 6. BORAX BEAD TESTS—Metallic oxides are dissolved by fused borax, and impart a characteristic color to a borax bead when heated in the flame. Make a loop of % inch diameter on one end of your nichrome wire. Heat the loop in the flame for a few moments and then dip it into some borax powder. Heat the powder in the flame and note that the borax swells up and forms a transparent bead in the loop. Dip the bead into some finely powdered malachite, and with some of it adhering, place it in the oxidizing flame. The malachite will fuse, and when examined again against the light, the bead will be found to be clear green while hot, and blue when cold. The following table contains a list of some of the common elements, their bead color in the oxidizing and reducing flames, and the minerals which contain these elements. Try the bead test for each mineral mentioned, making sure to use a very small quantity of the mineral, and also to prepare a new bead for each test. (Since the color of the bead changes in many instances as the bead cools, two colors are given: the color when hot, and the color when cold). Element Oxidizing Flamc Reducing Flame Mineral Hot Cold Hot Cold Manganese violet violet-red Colorless Pyrolusite Rhodonite Rhodochrosite Iron yellow pale-yellow green Hematite Magnetite Limonite Chromium yellow yellow-green emerald— Chromite green Nickel red yellow gray Millerite brown brown Niccolite violet EXPERIMENT 7. COBALT SOLUTION TESTS—Cobalt Chloride or Cobalt Nitrate unite with certain metallic oxides, forming characteristically colored compounds. Pulverize a smal] quantity of each of the following minerals and make a paste with some Cobalt Solution. Place the mixture on a charcoal block, and add the oxidizing blowpipe flame. See if the color reaction corresponds. Mineral Color Reaction Zinc Blende green Corundum blue Bauxite blue Magnesite pink he