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Pictures - you want pictures ?Later this afternoon. I need to make a deposit in the WC.
why ever NOT? I still like MY coprolite MUCH better than *that* piccie though if you want to know thanks JimBob for your indulgence!
...The coin is 17 mm diameter - it is called a "dime" here in America. This was found about 60 miles from where I live...
And NO! there are not any more types of rocks, at least on this planet. There are on other planets - sulfur compounds never possible under earth conditions, rocks made of gas, etc., etc.
LOL BassBUT..... before you all just pack up this threadI'm NOT done yetI just discovered something that slipped me by on my first speed reed [:I]Quote from: JimBob And NO! there are not any more types of rocks, at least on this planet. There are on other planets - sulfur compounds never possible under earth conditions, rocks made of gas, etc., etc. ROCKS MADE OUT OF GAS ?? Isnt' that ..... errr.......a contradiction in terms?Tell me more! ... and some pics if you possibly can, pruty please!
And NO! there are not any more types of rocks, at least on this planet.
Sedimentary rocks - rocks that have been weathered from another rock - doesn't matter what type - and formed in water or transported by water. Alluvial fans conglomerates that have formed on a mountainside and cemented by subsequent deposition of a substance, such as calcite, are sedimentary rocks even if they were not formed under water.
NO, Ignimbrites (volcanic ash that falls hot in the air then solidified while still hot) are NOT sedimentary rocks. Whats wrong with you guys???
Igneous rocks - formed from molten material. They are the most dense and the least dense of all rocks. Puzzled, think pumice - it can float if enough air is trapped in it.
Metamorphic rocks - rocks that have been partially melted/chemically altered and reformed. These can range form incipiently metamorphic rocks which can form at at low temp - pressure (6 km depth and 150° C). There are subtle changes in this type of metamorphic rock, grains are slightly altered in shape, some changes in cementing, some changes in chemistry but basically still the same rock and differences only detectable under a microscope. Other metamorphic rocks can form from an almost complete remelting and recrystallization. The typical ones thought about are those that were the former consistency of toothpaste.
The color is close to fosterite (ultramafic mineral), but my guess would be diopside/augite (mafic minerals). Minerals can be divided into two end spectrums- mafic and silicic. Mafic minerals tend to be iron, magnesium and calcium rich. In general, ultramafic and mafic minerals come from the mantle, silicic minerals from the continental crust. Fosterite, diopside and augite would form as metamorphic minerals from mafic igneous rocks, which is reasonable for your location.