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Igneous Rock

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Black Obsidian is a natural extrusive rock that occurs when lava cools so quickly that crystals are not able to form. This volcanic glass has been used by many ancient civilizations to craft weapons, mirrors, masks, and ornaments for centuries. Black Obsidian is said to be one of the oldest used minerals in human history. | Main Street Rocks

Black Obsidian is a natural extrusive rock that occurs when lava cools so quickly that crystals are not able to form. This volcanic glass has been used by many ancient civilizations to craft weapons, mirrors, masks, and ornaments for centuries. Black Obsidian is said to be one of the oldest used minerals in human history. | Main Street Rocks

已浏览 37 次5 个月之前

FacebookMain Street Rocks

SOLVED: Name the following rocks: 1. An extrusive rock with 40% Ca-rich plagioclase and 60% pyroxene 2. An intrusive rock with 65% plagioclase, 25% amphibole, and 10% pyroxene 3. An intrusive rock with 25% quartz, 20% orthoclase, 50% feldspar, and minor amounts of biotit | Numerade

SOLVED: Name the following rocks: 1. An extrusive rock with 40% Ca-rich plagioclase and 60% pyroxene 2. An intrusive rock with 65% plagioclase, 25% amphibole, and 10% pyroxene 3. An intrusive rock with 25% quartz, 20% orthoclase, 50% feldspar, and minor amounts of biotit | Numerade

2021年4月27日

SOLVED:Name the following rocks: a. An extrusive rock with 40 % Ca-rich plagioclase and 60 % pyroxene b. An intrusive rock with 65 % plagioclase, 25 % amphibole, and 10 % pyroxene c. An intrusive rock with 25 % quartz, 20 % potassium feldspar, 50 % plagioclase feldspar, and minor amounts of biotite

SOLVED:Name the following rocks: a. An extrusive rock with 40 % Ca-rich plagioclase and 60 % pyroxene b. An intrusive rock with 65 % plagioclase, 25 % amphibole, and 10 % pyroxene c. An intrusive rock with 25 % quartz, 20 % potassium feldspar, 50 % plagioclase feldspar, and minor amounts of biotite

2021年4月15日

What's the Difference Between Volcanic and Extrusive Rocks?

What's the Difference Between Volcanic and Extrusive Rocks?

2017年3月9日

Rhyolite in Thin Section | Extrusive Felsic Igneous Rock under Microscope | PPL, XPL Petrology

Rhyolite in Thin Section | Extrusive Felsic Igneous Rock under Microscope | PPL, XPL Petrology

已浏览 80 次2022年7月7日

FacebookEarth Detective

PPT - Intrusive and Extrusive Igneous Rock Structures PowerPoint Presentation - ID:1288135

PPT - Intrusive and Extrusive Igneous Rock Structures PowerPoint Presentation - ID:1288135

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Is porphyritic intrusive and extrusive? - TimesMojo

Is porphyritic intrusive and extrusive? - TimesMojo

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All About Extrusive Igneous Rocks (With Pictures)

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What type of rock shows porphyry? - TimesMojo

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Igneous Rocks: Formation and Types Explained in 60 Seconds! #rocks #facts #environmentalscience

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Earth’s Structure and Materials Igneous & Metamorphic Rocks

2017年8月29日

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GEOLOGIST finds volcanic rock intrusion #rockhound #faults #rocks #geology #science #earthscience

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已浏览 3565 次2014年11月14日

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已浏览 3131 次2015年4月25日

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2020年11月4日

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已浏览 1886 次2018年3月12日

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