To use our Mineral Identification Flow Chart, it will be easiest if you print out your own copy first.The flow chart moves from left to right, following the arrows. Step 1: Select a Mineral - Choose a mineral that you want and place it on the "Mineral to Identify" block. Step 2: Test the color of the streak. - If you see a colored streak.

ordered list of minerals' hardness. How does it work? Steps for testing the hardness of a mineral: 1. Select a fresh surface of the unknown mineral. 2. Hold the mineral and scratch it with an object/ mineral of known hardness, e.g. fingernail (H = 2.5) or quartz (H = 7) (or whatever is most convenient — its hardness must be known though). 3.

HARDNESS SCALE CHART WITH MATERIAL REFERENCE Tensile Strength - PSI MATERIAL REF. ROCKWELL SCALE ROCKWELL SUPERFICIAL BRINNELL Tensile Strength PSI RCD Custom Machinery 7900 N Radcliffe Street, Building 100 Bristol PA, 19007 267-585-3719 1/4. 191,000 72 113 42 57 - - - - 82 61 46 - - 390 - - 56 191,000

Minerals can be classified according to their chemical composition or Moh's hardness scale, see Figure 1. Rocks are composed of assemblages of minerals. The arrangement and size of the individualgrains of these minerals give the rock an individual form or : texture. Figure 2 shows a classification of the mineral

Crystalline, medium hardness (H = 3-3.5), white to gray. Forms te masses. Alternating layers of Earthy white gypsum and gray calcite. Soft H=2 to 3 Fines with HCI. Hard (11=7), conchoidal fracture, variable color (gray to brown). Petrified wood variety displays cellular structure. Fine to coarsely crystalline, yellow to white, lacks fossils but

The hardest rocks, or those requiring the largest energy input to drill a unit volume of drill-hole, are classed as A+, A, and A—, using three groups for each letter. The softest rocks or those requiring the least energy input per unit volume drilled are classed D+, D, and D—, with the rocks of intermediate hardness between.

Below is the Mohs scale, going from softest to hardest. 1 -Talc. 2 -Gypsum. 3 -Calcite. 4 - Fluorite. 5 - Apatite. 6 - Orthoclase feldspar. 7 - Quartz.

Diamonds are the hardest stones, while talc is a very soft mineral. The scale by which the hardness of gemstone minerals are measured is the Mohs Scale of 

The value of N is either 100 or 130 depending on the Rockwell hardness scale used. Similarly, the value of s is either 0.001 mm or 0.002 mm. d is the penetration depth measured from zero points (in mm). Rockwell Hardness Scale

It can scratch a diamond just in a diamond. Corundum, topaz (8), quartz (7), and anything weaker will scratch themselves. The Mohs gemstone hardness scale is 

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