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" The standard scale, which consists of 10 common minerals arranged in order of increasing hardness, is as follows: 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Feldspar 7. Quartz 8. Topaz 9. Corundum 10. Diamond By using the above reference minerals,... "
Encyclopædia Americana: A Popular Dictionary of Arts, Sciences, Literature ... - Page 507
edited by - 1851
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Elements of Engineering Geology

Heinrich Ries, Thomas Leonard Watson - Engineering geology - 1930 - 462 pages
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Archaeology of North America, Hall B (ground Floor)

Paul Sidney Martin - Anthropology - 1933 - 158 pages
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The Chemical Formulary

Harry Bennett - Chemistry - 1936 - 598 pages
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Getting Acquainted with Minerals

George Letchworth English - Mineralogy - 1934 - 344 pages
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Handbook of Engineering Fundamentals

Ovid Wallace Eshbach - Engineering - 1936 - 1126 pages
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Mineralogy: An Introduction to the Study of Minerals and Crystals

Edward Henry Kraus - Crystallography - 1959 - 740 pages
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Handbook of Engineering Fundamentals

Ovid Wallace Eshbach - Engineering - 1936 - 1116 pages
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Chemical Principles: With Particular Application to Qualitative Analysis

John Howe Yoe - Analytical chemistry - 1937 - 332 pages
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Matter, Energy and Radiation

John Ray Dunning, Hugh Campbell Paxton - Matter - 1941 - 696 pages
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Byways to Adventure: A Guide to Nature Hobbies

Edwin Way Teale - Natural history - 1942 - 282 pages
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