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2. Rutile - Wikipedia

   en.wikipedia.org/wiki/Rutile

   Mohs scale hardness: 6.0–6.5: Luster: Adamantine to metallic: Streak: Bright red to dark red: Diaphaneity: Opaque, transparent in thin fragments: Specific gravity: 4.23 increasing with Nb–Ta content: Optical properties: Uniaxial (+) Refractive index: n ω = 2.613, n ε = 2.909 (589 nm) Birefringence: 0.296 (589 nm) Pleochroism: Weak to ...

3. Rutilated quartz - Wikipedia

   en.wikipedia.org/wiki/Rutilated_quartz

   Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black.

4. List of mineral tests - Wikipedia

   en.wikipedia.org/wiki/List_of_mineral_tests

   The Mohs Hardness Scale is the main scale to measure mineral hardness. Finger nail is 2.5, copper coin is 3.5, glass is 5.5 and steel is 6.5. Hardness scale is Talc is 1, Gypsum is 2, Calcite is 3, Fluorite is 4, Apatite is 5, Orthoclase Feldspar is 6, Quartz is 7, Topaz is 8, Corundum is 9 and Diamond is 10. Odor; Not always recommended.

5. Hardness scales - Wikipedia

   en.wikipedia.org/wiki/Hardness_scales

   Hardness scales may refer to: Methods of measuring mineral hardness. Scratch hardness. The Mohs scale of mineral hardness; The Vickers hardness test;

6. Rosiwal scale - Wikipedia

   en.wikipedia.org/wiki/Rosiwal_scale

   The Rosiwal scale attempts to give more quantitative values of scratch hardness, unlike the Mohs scale which is a qualitative measurement with relative values. The Rosiwal method (also called the Delesse-Rosiwal method [ 1 ] ) is a method of petrographic analysis and is performed by scratching a polished surface under a known load using a ...

7. ‘Latinos Break The Mold’ by Huffington Post

   testkitchen.huffingtonpost.com/latinos-break-the...

   Latinos Define Their Identity In Stunning Photo Essay

8. US farm groups want Trump to spare their workers from ... - AOL

   www.aol.com/news/us-farm-groups-want-trump...

   U.S. farm industry groups want President-elect Donald Trump to spare their sector from his promise of mass deportations, which could upend a food supply chain heavily dependent on immigrants in ...

9. Rockwell scale - Wikipedia

   en.wikipedia.org/wiki/Rockwell_scale

   The superficial Rockwell scales use lower loads and shallower impressions on brittle and very thin materials. The 45N scale employs a 45-kgf load on a diamond cone-shaped Brale indenter, and can be used on dense ceramics. The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal.