Neptunite crystals in their host rock. Close-up of Neptunite (black) crystals within a host rock composed of natrolite (white). Natrolite is a tectosilicate that belongs to the zeolite group of minerals. Like most zeolites, natrolite occurs in cavities or open cracks in basaltic igneous rocks. Neptunite is a complex silicate mineral. This sample is from San Benito County, California, USA.

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TOP10391910

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達志影像

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