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Volcanic ash | Volcanic ash is a fine mixture of minerals and rock fragments thrown out of a volcano during exposive volcanic eruption. |
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Glass sand | Traces of human activity are visible almost everywhere. Even sand may sometimes contain artificial fragments in quantities that justify the creation of a separate sand type. |
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Immature sand | Sand composed of the same minerals that made up its parent rocks. |
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Gypsum sand | A rare sand type composed of gypsum grains. |
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Ooid sand | Ooids are rounded pellets formed in a shallow wave agitated water. |
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Silica sand | Silica sand is almost pure quartz. |
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Black sand | There are two types of black sand. |
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Greensand | Greensand and green sand. What is the difference? |
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Desert sand | What are the characteristic features of dune sand? |
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Lithic sand | Sometimes sand is composed of tiny rocks. |
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Mixed carbonate-silicate sand | Some sand samples are mixture of organic and inorganic sand grains. |
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Biogenic sand | Sand may be composed entirely of tiny skeletons — sea shells, corals, forams, etc. |
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Garnet sand | Garnet is a common mineral in sand but sometimes it forms the majority of it. |
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Olivine sand | Olivine is very unstable in the weathering environment. Still, it is surprisingly common sand mineral in some regions and sometimes makes up major part of the sand. |
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Volcanic sand | Volcanically active regions have their own unique type of generally dark-colored sand with a characteristic mineral assemblage. |
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Heavy mineral sand | Heavy minerals are present in most sand types. However, they rarely make up more than few percent of it. Sometimes heavy minerals get concentrated enough to form heavy and usually very beautiful sand. |
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Sands with hematitic pigment | Hematite is the mineral that gives reddish color to desert sands and sandstone formations all over the world. |
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Continental sand | The name says it all. This sand is common weathering product of the continental landmasses. |
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Quartz sand | Quartz is the most common sand forming mineral. This sand type consists little else than this mineral. |
