Penal Code § 1170.74

Upon conviction of a felony violation of Section 11377, 11378, 11379, or 11379.6 of the Health and Safety Code, for an offense involving methamphetamine, the fact that the controlled substance is the crystalline form of methamphetamine shall be considered a circumstance in aggravation of the crime in imposing a term under subdivision (b) of Section 1170.