Het Patel Posted September 18, 2021 Share Posted September 18, 2021 Can some one help me if we would rub a fossil against a porcelain tile what streak colour will it have? Link to comment Share on other sites More sharing options...
Ludwigia Posted September 18, 2021 Share Posted September 18, 2021 There is no general answer to that, since it would depend upon which mineral substance(s) is/are present in the fossil. Minerals give off the streak color, not fossils. 2 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Het Patel Posted September 18, 2021 Author Share Posted September 18, 2021 So at the end fossil does not have any streak colour? Link to comment Share on other sites More sharing options...
Ludwigia Posted September 18, 2021 Share Posted September 18, 2021 1 hour ago, Het Patel said: So at the end fossil does not have any streak colour? Correct. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
digit Posted September 18, 2021 Share Posted September 18, 2021 Each mineral is (by definition) a chemical compound with a well defined chemical composition and ordered atomic arrangement. Iron ore, graphite, halite (salt), gypsum will all leave different color streaks due to their composition. Most fossils are what is known as pseudomorphs which is to say that the original remains of the long dead plant or animal have been replaced by minerals preserving the shape of the original. Some fossils are preserved in shale, some in limestone or dolomite. Some fossils (really pretty ones) are preserved in pyrite (fool's gold) and many fossils (notably) megalodon shark teeth are preserved in a high phosphate environment causing them to turn grayish black. Some famously beautiful Australian fossils are replaced with colorful opal. The streak color of a fossil will depend on its method of preservation--the types of minerals that replaced the organic matter will determine the streak color (and the hardness). Cheers. -Ken 1 Link to comment Share on other sites More sharing options...
Het Patel Posted September 18, 2021 Author Share Posted September 18, 2021 19 minutes ago, digit said: Each mineral is (by definition) a chemical compound with a well defined chemical composition and ordered atomic arrangement. Iron ore, graphite, halite (salt), gypsum will all leave different color streaks due to their composition. Most fossils are what is known as pseudomorphs which is to say that the original remains of the long dead plant or animal have been replaced by minerals preserving the shape of the original. Some fossils are preserved in shale, some in limestone or dolomite. Some fossils (really pretty ones) are preserved in pyrite (fool's gold) and many fossils (notably) megalodon shark teeth are preserved in a high phosphate environment causing them to turn grayish black. Some famously beautiful Australian fossils are replaced with colorful opal. The streak color of a fossil will depend on its method of preservation--the types of minerals that replaced the organic matter will determine the streak color (and the hardness). Cheers. -Ken Thank you for explaining. Your beloved -het Link to comment Share on other sites More sharing options...
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