The present invention Cu-K α in a powder X-ray diffraction according to the line has a main peak at a diffraction angle range of 20.0~23.0 ° (2θ ± 0.3 °), a water content of 0.01 to 3.4% by weight of long-chain acyl glutamic acid N- and / or provides a salt crystal, detergent compositions and cosmetic compositions containing the production method of the crystal, and the crystal. Product containing the crystal is excellent in form retention at the time out, and fine foam-forming.
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