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A. The results of John and Sarah's experiment are shown below. Notice that the images are enlarged. Beside each image below, measure and record the actual size range of the crystals (in mm) that formed. Molten thymol in the cold Petri dish crystallized in 1 minute and looked like this enlarged view. Molten thymol in the hot Petri dish crystallized in 3 minutes and looked like this enlarged view. 5 mm 5 mm Actual size of the crystals in mm is: Actual size of the crystals in mm is: B. Igneous rocks that are made of crystals too small to see with your naked eyes or hand lens are said to have an aphanitic texture (from the Greek word for invisible). Those made of visible crystals are said to have a phaneritic texture (crystals -1-10 mm) or pegmatitic texture (crystals >1 cm). Which of these three igneous rock textures probably represents the most rapid cooling of magma/lava? C. This rock has a "porphyritic texture," which means that it contains two sizes of crystals. The large white plagioclase crystals are called phenocrysts and sit in a green-gray “groundmass" of more abundant, smaller (aphanitic) crystals. Explain how this texture may have formed (more than one answer is possible).

A. The results of John and Sarah's experiment are shown below. Notice that the images are enlarged. Beside each image below, measure and record the actual size range of the crystals (in mm) that formed. Molten thymol in the cold Petri dish crystallized in 1 minute and looked like this enlarged view. Molten thymol in the hot Petri dish crystallized in 3 minutes and looked like this enlarged view. 5 mm 5 mm Actual size of the crystals in mm is: Actual size of the crystals in mm is: B. Igneous rocks that are made of crystals too small to see with your naked eyes or hand lens are said to have an aphanitic texture (from the Greek word for invisible). Those made of visible crystals are said to have a phaneritic texture (crystals -1-10 mm) or pegmatitic texture (crystals >1 cm). Which of these three igneous rock textures probably represents the most rapid cooling of magma/lava? C. This rock has a "porphyritic texture," which means that it contains two sizes of crystals. The large white plagioclase crystals are called phenocrysts and sit in a green-gray “groundmass" of more abundant, smaller (aphanitic) crystals. Explain how this texture may have formed (more than one answer is possible).

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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John and Sarah are doing an experiment to find out if crystal size in igneous rocks can be related to the speed of cooling a magma/lava. They did not have equipment to melt rock, so they used thymol to model pieces of rock. Thymol melts easily at low temperature on a hot plate, and it cools and recrystallizes quickly. Thymol is a transparent, crystalline organic substance derived from the herb, thyme, and is used in antiseptics and disinfectants. It is not toxic, but does give off a very strong pungent odor that can irritate skin and eyes and cause headaches. Therefore, John and Sarah used a spoon to handle the thymol and did all of their work under a fume hood with supervision from their teacher. Sarah placed some thymol in a small Pyrex beaker and melted it completely under a fume hood to model the formation of magma. John poured one half of the molten thymol into a cold Petri dish and the other half into a hot Petri dish of the same size. A. The results of John and Sarah's experiment are shown below. Notice that the images are enlarged. Beside each image below, measure and record the actual size range of the crystals (in mm) that formed. Molten thymol in the cold Petri dish crystallized in 1 minute and looked like this enlarged view. Molten thymol in the hot Petri dish crystallized in 3 minutes and looked like this enlarged view. 5 mm 5 mm Actual size of the crystals in mm is: Actual size of the crystals in mm is: B. Igneous rocks that are made of crystals too small to see with your naked eyes or hand lens are said to have an aphanitic texture (from the Greek word for invisible). Those made of visible crystals are said to have a phaneritic texture (crystals -1-10 mm) or pegmatitic texture (crystals > 1 cm). Which of these three igneous rock textures probably represents the most rapid cooling of magma/lava? C. This rock has a "porphyritic texture," which means that it contains two sizes of crystals. The large white plagioclase crystals are called phenocrysts and sit in a green-gray "groundmass" of more abundant, smaller (aphanitic) crystals. Explain how this texture may have formed (more than one answer is possible).
Transcribed Image Text:John and Sarah are doing an experiment to find out if crystal size in igneous rocks can be related to the speed of cooling a magma/lava. They did not have equipment to melt rock, so they used thymol to model pieces of rock. Thymol melts easily at low temperature on a hot plate, and it cools and recrystallizes quickly. Thymol is a transparent, crystalline organic substance derived from the herb, thyme, and is used in antiseptics and disinfectants. It is not toxic, but does give off a very strong pungent odor that can irritate skin and eyes and cause headaches. Therefore, John and Sarah used a spoon to handle the thymol and did all of their work under a fume hood with supervision from their teacher. Sarah placed some thymol in a small Pyrex beaker and melted it completely under a fume hood to model the formation of magma. John poured one half of the molten thymol into a cold Petri dish and the other half into a hot Petri dish of the same size. A. The results of John and Sarah's experiment are shown below. Notice that the images are enlarged. Beside each image below, measure and record the actual size range of the crystals (in mm) that formed. Molten thymol in the cold Petri dish crystallized in 1 minute and looked like this enlarged view. Molten thymol in the hot Petri dish crystallized in 3 minutes and looked like this enlarged view. 5 mm 5 mm Actual size of the crystals in mm is: Actual size of the crystals in mm is: B. Igneous rocks that are made of crystals too small to see with your naked eyes or hand lens are said to have an aphanitic texture (from the Greek word for invisible). Those made of visible crystals are said to have a phaneritic texture (crystals -1-10 mm) or pegmatitic texture (crystals > 1 cm). Which of these three igneous rock textures probably represents the most rapid cooling of magma/lava? C. This rock has a "porphyritic texture," which means that it contains two sizes of crystals. The large white plagioclase crystals are called phenocrysts and sit in a green-gray "groundmass" of more abundant, smaller (aphanitic) crystals. Explain how this texture may have formed (more than one answer is possible).
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