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3. In gravels and conglomerates containing pebbles of both limestone and quartzite, the limestone pebbles are usually more rounded and smaller than the quartzite pebbles (recall that quartzite consists of quartz crystals, while limestone consists of crystals of calcite). Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and calcite? How does this affect the degree of rounding and the grain size of the two clast types? 4. Feldspar minerals (orthoclase and plagioclase) have almost the same hardness value as quartz, yet in sands and sandstones that contain rounded quartz grains, the feldspar grains are often angular or sub-angular. Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and feldspar? How does this affect the degree of rounding of the two clast types?

3. In gravels and conglomerates containing pebbles of both limestone and quartzite, the limestone pebbles are usually more rounded and smaller than the quartzite pebbles (recall that quartzite consists of quartz crystals, while limestone consists of crystals of calcite). Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and calcite? How does this affect the degree of rounding and the grain size of the two clast types? 4. Feldspar minerals (orthoclase and plagioclase) have almost the same hardness value as quartz, yet in sands and sandstones that contain rounded quartz grains, the feldspar grains are often angular or sub-angular. Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and feldspar? How does this affect the degree of rounding of the two clast types?

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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3. In gravels and conglomerates containing pebbles of both limestone and quartzite, the limestone pebbles are usually more rounded and smaller than the quartzite pebbles (recall that quartzite consists of quartz crystals, while limestone consists of crystals of calcite). Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and calcite? How does this affect the degree of rounding and the grain size of the two clast types? 4. Feldspar minerals (orthoclase and plagioclase) have almost the same hardness value as quartz, yet in sands and sandstones that contain rounded quartz grains, the feldspar grains are often angular or sub-angular. Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and feldspar? How does this affect the degree of rounding of the two clast types?
Transcribed Image Text:3. In gravels and conglomerates containing pebbles of both limestone and quartzite, the limestone pebbles are usually more rounded and smaller than the quartzite pebbles (recall that quartzite consists of quartz crystals, while limestone consists of crystals of calcite). Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and calcite? How does this affect the degree of rounding and the grain size of the two clast types? 4. Feldspar minerals (orthoclase and plagioclase) have almost the same hardness value as quartz, yet in sands and sandstones that contain rounded quartz grains, the feldspar grains are often angular or sub-angular. Which mineral property is probably responsible for the difference in roundness? How does this property differ between quartz and feldspar? How does this affect the degree of rounding of the two clast types?
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