- The extract was further purified by column chromatography to get the acicular crystals of reserpine of 99.
- Pit mud aging appears as the existence of white granule or acicular crystals on pit walls and further the emergence of green or red substances.
- The iron content of grainy crystal was the most, acicular crystal taking second place.
- The results show that the phosphating film formed under ultrasonic wave is granule and acicular crystal,it is even,smooth,dense.It has better corrosion resistance and binding force.
- Each mineral has crystals of a particular shape.