How to distinguish between real quartz and glass? Why it is difficult based on appearance alone

When looking at a bracelet with transparent round beads, I sometimes wonder."Is this really quartz?"Things sold as quartz ...

Vol. 79 [Why do precision optical lenses sometimes slightly distort images even when they have no scratches or fog?] The barrier to entry known as stress birefringence, where ...

The misconception that "if it is transparent and smooth, light passes through straight"1.1 Transparent, scratch-free lenses appear to let light pass through straightMany people think that precision le ...
Mathrubhumi

പ്രപഞ്ചത്തിനും ‘ട്വിസ്റ്റോ’!; കണ്ടെത്താൻ പുതിയ മാർഗമൊരുക്കി ...

മലയാളി ശാസ്ത്രജ്ഞനായ ആന്റോ ലോനപ്പൻ നേതൃത്വം നൽകിയ ഗവേഷക സംഘം ...