Introduction to Optical Mineralogy And Petrography the Practical Methods of Id
Introduction to Optical Mineralogy And Petrography the Practical Methods of Id
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Pyroxene amphibole biotite diorite.
stone Park.
2. Quartz mica hypersthene diorite from Pfundersberg, Tyrol.
3. Mica hypersthene diorite from Campomaior, Portugal.
4. Amphibole diorite from Neunseestein Barr, Alsace.
5. Augite diorite from Richmond, Minnesota.
Discussion of Analyses: These analyses when compared with the analyses of granite show that 1. Iron, lime, magnesia and alumina contents are higher.
2. Alkali content is lower.
3. Soda predominates over potash.
4. Silica is lower, due to ...change of feldspar.
5. The specific gravity is higher.
GABBRO AND NORITE FAMILY.
Mineralogical Composition. Basic plagioclase and usually a pyroxene.
Texture. Granitoid. Never porphyritic. Relationship. Gabbros grade by decrease in plagio- clase to the more basic pyroxenites and peridotites.
IGNEOUS ROCK TYPES PLUTONIC ROCKS 151 Varieties. Essential to all, basic plagioclase.
1. Gabbro, with addition of diallage.
2. Hornblende gabbro, with addition of hornblende.
3. Olivine gabbro, with addition of olivine and diallage.
What to read after Introduction to Optical Mineralogy And Petrography the Practical Methods of Id?
You can find similar books in the "Read Also" column, or choose other free books by M G Edwards to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Pyroxene amphibole biotite diorite.
stone Park.
2. Quartz mica hypersthene diorite from Pfundersberg, Tyrol.
3. Mica hypersthene diorite from Campomaior, Portugal.
4. Amphibole diorite from Neunseestein Barr, Alsace.
5. Augite diorite from Richmond, Minnesota.
Discussion of Analyses: These analyses when compared with the analyses of granite show that 1. Iron, lime, magnesia and alumina contents are higher.
2. Alkali content is lower.
3. Soda predominates over potash.
4. Silica is lower, due to ...change of feldspar.
5. The specific gravity is higher.
GABBRO AND NORITE FAMILY.
Mineralogical Composition. Basic plagioclase and usually a pyroxene.
Texture. Granitoid. Never porphyritic. Relationship. Gabbros grade by decrease in plagio- clase to the more basic pyroxenites and peridotites.
IGNEOUS ROCK TYPES PLUTONIC ROCKS 151 Varieties. Essential to all, basic plagioclase.
1. Gabbro, with addition of diallage.
2. Hornblende gabbro, with addition of hornblende.
3. Olivine gabbro, with addition of olivine and diallage.
What to read after Introduction to Optical Mineralogy And Petrography the Practical Methods of Id?
You can find similar books in the "Read Also" column, or choose other free books by M G Edwards to read onlineMoreLess
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