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AutoSave or Lab-10 silicate processes Picture Tools Mihaela Manea File Home Insert Design Transitions Animations Slide Show ReviewView Format Tell me what you want to do Share Sci-210 Lab-10 (Microscopy world) 15 Nov 2017 Silicate type 1. Following is an image of a crystal (marked 'x" right image), which shows some structure that clues into its type of silicate polymer. Exi your reasoning: 2. Phase diagram in action The crystal below shows a bizarre structure with 'worm like' intrusions within the cross hatched pattered crystal. Using the phase diagram below (right), explain what may be occurring to the crysta Dr.A shama, al z. i Lab-10 (Microscopy world) 13 Nuv zu1 KAlSi2O6 NaAlSi20 Liquid 1200 1000 Alkali Fel Solution +Liquid 00 Alkali Feldspar Solid Solution 600 2 Feldspars I 400 200 20 60 80 100 KAIS 308 Tap to add notes s Lab-10 (Microscopy world) 15Nv 2017 Slide 1 of 3 Notes + 90% E 2:20 PM lype here to search 11/16/2017Explanation / Answer
Answer 1 : the first crystal is of amphibole and the name of the crystal is hornblende. it can easily be identified based on the cleavage which is 120 degree. The lines shown in fig are the basal cleavage plane which is intersecting at the 120-degree angle which is the signature of amphiboles.
Answer 2: This is called Perthitic texture it formed when Sodium feldspar(NaAlSi3O8) is present in the K- feldspar(KAlSi3O8). The mechanism of the formation of this texture can easily be explained by given diagram. When melt of composition A (shown in fig) is cooled so much that its cooling line hit the bottom curve (solidus) shown in fig then Na and K feldspars are no longer stable together and they form a separate phase we called antiperthite ( if Potassium is dominate) .
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