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Although the quote is specific to the orebody of the now-abandoned marble quarry, it also suggests the potential for contact metamorphism and metasomatism that impacted and altered the actinolite and the specular hematite into nephrite and magnetite. Mineralogy/Petrology of the Nephrite Nephrite jade is essentially a monomineralic rock composed of amphiboles from the actinolite-tremolite series with occasional other impurities (Ling et al. [8]). B For well over half a century b , Southern California collectors have known about and tried to collect black nephrite jade with sparkling rosettes of magnetite from a unique deposit adjacent to the Verde Antique Marble quarry (Sec. 28, T. 7 N., R. 2 W., San Bernardino base and meridian). Magnetite in nephrite has been identified in many other nephrite jade deposits worldwide. [Extracted from the article]

The article focuses on history of kunzite, a variety of spodumene that can be recognize for its pink and lilac to bluish-purple color. It states Fred M. Sickler is credited as the discovery of spodumene gem because he is the first to present an example of the mineral to George F. Kunz. It also mentions that kunzite was discovered at Simmons mine, Pala Chief Mine, and Vanderberg mine. It also mention that there were kunzite finds in California, Brazil, and Madagascar.