By Ralf Tappert
Diamonds in Nature: A advisor to tough Diamonds illustrates the diversity of crystal shapes, shades, floor textures, and mineral inclusions of tough, uncut, clearly forming diamonds. each one bankruptcy includes pictures that convey the original actual features of the diamonds, and the accompanying textual content describes the approaches that ended in their formation. This e-book is a useful reference guide for pro geoscientists—including gemmologists and exploration geologists.
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Extra resources for Diamonds in Nature: A Guide to Rough Diamonds
2-45). 168 The monocrystalline diamonds enclosed by ﬁbrous coats are often well-crystallized, sharp-edged octahedra (Fig. 2-46). Fibrous diamonds can grow in concentric layers, and diamonds with very obvious concentric layering are sometimes referred to as hailstones or hailstone boarts (Fig. 2-47). The habits of ﬁbrous diamonds often resemble those of monocrystalline diamond cubes (Fig. 2-48), but they can also be nondescript (Fig. 2-49). Similar to monocrystalline diamond cubes, ﬁbrous diamond cubes generally have rough surfaces and rounded edges (Fig.
42, 111, 315, 324 In other words, each deposit contains diamonds with a characteristic distribution of resorbed and un-resorbed crystals. g. g. g. 0 ct). The transparency of these monocrystalline diamond cubes contrasts the cloudiness of ﬁbrous diamond cubes. Diamond cubes 2-13: Diamond cubes with different types of surface development. Drawings from Fersmann and Goldschmidt (1911). 22 A small number of monocrystalline diamonds exhibit a distinctive cubic habit. These diamonds always have conspicuously rugged crystal faces and rounded edges (Fig.
2-49: Fibrous diamond with a non-descript shape (Ø: ~1 cm). 37 THE MORPHOLOGY OF DIAMONDS 2-50: Ballas: a spherical variety of ﬁbrous diamond. 18 ct). 2-51: Relationship between coat thickness and habit of an octahedral diamond with a ﬁbrous coat. A. uncoated B. thin coat C. thick coat D. 19 ct). The octahedral crystal faces are marked by numerous trigons. 38 B C D THE MORPHOLOGY OF DIAMONDS 2-53: Polished section through a sharp-edged octahedral diamond with a thick ﬁbrous coat (Ø: ~7 mm). The ﬁbrous coat exhibits faint concentrical layering.