5 Comments

  1. @jackywang9620 on April 22, 2024 at 6:16 pm

    dear ,i want to buy clear double refraction calcite



  2. @earthsciencewithsara7647 on April 22, 2024 at 6:20 pm

    This is exactly the kind of video I was looking for to insert into a mineral identification lecture. Thank you!



  3. @ronritekinamatigai on April 22, 2024 at 6:30 pm

    Sigh, what a waste.



  4. @jackywang9620 on April 22, 2024 at 6:39 pm

    1198277513@qq.com ,+86-18620074800



  5. @graysonshepard1535 on April 22, 2024 at 6:42 pm

    "We might need a new petri d-"