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<blockquote data-quote="Allen" data-source="post: 418173" data-attributes="member: 389">There are plenty of examples of straight lines in the world of geology:[ATTACH=full]68784[/ATTACH]And while that's on a pretty large scale, right down to the molecular level, a fair number of minerals have a cubic crystal lattice:[ATTACH=full]68785[/ATTACH][ATTACH=full]68786[/ATTACH]The first image is Devil's Tower and shows the natural tendency for basalt to fracture along lengthy straight lines in its cooling process.&nbsp; The second two images are your ordinary table salt (NaCl) and Pyrite (FeS2) and show how clean those lines can be when there are not many impurities.&nbsp; Of course, impurities along with weathering can muck up the natural crystal lattice, but they are there.Cubic is just one of several crystal lattices that have straight lines:<a href="https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Inorganic_Chemistry_(LibreTexts)/07%3A_The_Crystalline_Solid_State/7.02%3A_Formulas_and_Structures_of_Solids/7.2.02%3A_Lattice_Structures_in_Crystalline_Solids" target="_blank">https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Inorganic_Chemistry_(LibreTexts)/07:_The_Crystalline_Solid_State/7.02:_Formulas_and_Structures_of_Solids/7.2.02:_Lattice_Structures_in_Crystalline_Solids</a></blockquote>

[QUOTE="Allen, post: 418173, member: 389"] There are plenty of examples of straight lines in the world of geology: [ATTACH type="full" alt="1721923730221.png"]68784[/ATTACH] And while that's on a pretty large scale, right down to the molecular level, a fair number of minerals have a cubic crystal lattice: [ATTACH type="full" alt="1721923926115.png"]68785[/ATTACH] [ATTACH type="full" alt="1721923966840.png"]68786[/ATTACH] The first image is Devil's Tower and shows the natural tendency for basalt to fracture along lengthy straight lines in its cooling process. The second two images are your ordinary table salt (NaCl) and Pyrite (FeS2) and show how clean those lines can be when there are not many impurities. Of course, impurities along with weathering can muck up the natural crystal lattice, but they are there. Cubic is just one of several crystal lattices that have straight lines: [URL='https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Inorganic_Chemistry_(LibreTexts)/07%3A_The_Crystalline_Solid_State/7.02%3A_Formulas_and_Structures_of_Solids/7.2.02%3A_Lattice_Structures_in_Crystalline_Solids']https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Inorganic_Chemistry_(LibreTexts)/07:_The_Crystalline_Solid_State/7.02:_Formulas_and_Structures_of_Solids/7.2.02:_Lattice_Structures_in_Crystalline_Solids[/URL] [/QUOTE]

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