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Introduction on Tectosilicates
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Introduction on Tectosilicates

In the previous tutorial we learned about some types of silicates, so now let's learn about the rest. That will be inosilicates, ... Oxygen, silicon, and aluminium are the most abundant elements in the surface of the earth; more than 80% of the atoms in the ... Lecture on structure of SiO2 polymorphs, opal, feldspathoids, feldspars and zeolites, followed by rock classification discussion. Luster - vitreous Streak - white Hardness - 5-6 Density - low density Cleavage - none Color - variable Crystal system - amorphous ... Luster - Vitreous Streak - white Hardness - 7 Density - moderatley low Cleavage - none Color - variable, usually pale colors ... Luster - vitreous Streak - white Hardness - 6-6.5 Density - moderately low density Cleavage - two planes @ 90 degrees Color ...

Luster - vitreous, sub vitreous Streak - white Hardness - 6-6.5 Density - moderately low density Cleavage - two planes at 90 ... At high temperatures there is complete solid solution in the alkali feldspars wherein sodium ions and potassium ions are ... Following Strunz's classification of silicates, along with tectosilicates, are quartz, feldspar, and feldspathoids. Silicates ... Luster - vitreous Streak - white, very pale brown (biotite) Hardness - 3-4 Density - moderately low Cleavage - perfect 1 direction, ... One of the known rocks to be fake jade. Under cross polarised light you can clearly seen the microcrystalline/cryptochrstalline ... Quartz in microcrystalline and cryptocrystalline form. Confirmation of cryptocrystalline with x1000 magnification under light ...

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Post video I realised I am confusing two terms that are both present! Carlsbad twinning: two twin crystals growing together ... Subject: Geology Paper: Crystallography and mineralogy Module: Tektosilicates - Quartz Content Writer: Naresh C Pant. Mostly Ca plagioclase so looking for lots of simple twinning. Detrital Optical Mineralogy reference material. In this video, we discuss the complete classification of silicate structures in a simple and exam-oriented way. Silicates are the most ...