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Figure 1
(a) Virtual quartz group. The shape was simulated with the modified BFDH model as well as rendered with WinXMorph, applying an up to 10% statistical scaling of independent faces, and standard textures (growth striations) of clear crystals were applied to the faces. Model crystals were then scaled and grouped. (b) Smoky quartz, with darker body, 20% variation between all faces. (c) Rose quartz with pink body and marbled surface. All models are freely moveable on the computer in real time. Real crystals: (d) author's photograph; (e) https://www.stonekeeper.com ; (f) https://www.all-about-feng-shui.co.uk .

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 40| Part 2| March 2007| Pages 382-385
doi:10.1107/S0021889807003986
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