Reason: If the fluorescent stone is placed under the white fluorescent lamp, it will emit beautiful fluorescence, which is obviously weak in the day and strong at night. "Night Pearl" is a kind of natural gem, which can be seen clearly by human eyes in the dark and can glow by itself.

Night Pearl: You can glow by yourself at night. According to this feature, geologists speculate that the night pearl is probably fluorite, because among the gems that can be mined by ancient Chinese, only fluorite has the characteristic of self-luminescence after absorbing sunlight. Fluorite has a high content in geological reserves and is not a precious gem resource.

Recognition method of natural luminous pearls based on extended data;

1, light gray fluorite that can continuously emit light for dozens of hours after being illuminated 15 minutes.

2, it has phosphorescence, which can not only produce the quasi-effect of the night pearl.

3, beautiful color, translucent, without any light, that is, permanent active luminescence, and the luminous energy is large.

4. Be sure to distinguish between fluorescence and phosphorescence of fluorite. Phosphorescence is caused by external light source, which can keep a certain luminous time after removal.

5. Observe its luminous length, uniformity, half-life and afterglow.

Baidu encyclopedia-night pearl