English: Optical mineralogy: Photomicrographs of thin section from Siilinjärvi apatite ore. Tetraferriphlogopite grains in thin section H10. The sample is only slightly deformed (shear grade 3), and the mica flakes are bent, but still mainly unbroken. Photomicrograph from thin section in cross and plane polarised light.
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کانیشناسی نوری: عکسبرداری از برش نازک از سنگ معدن آپاتیت Siilinjärvi. دانه های تترافریفلوگوپیت در مقطع نازک H10. نمونه فقط کمی تغییر شکل داده است (درجه برشی ۳)، و تکه های میکا خمیده هستند، اما هنوز عمدتاً شکسته نشده اند. فتومیکروگراف از مقطع نازک