Axinite is a blue, violet-blue, brownish or reddish-brown mineral composed of calciumaluminumboro-silicate. Mohs hardness is 6.5-7. Refractive index is 1.68-1.723. Specific gravity is 3.26-3.41. Crystal structure is triclinic.
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... proposal was confirmed 20 years later by using the O18 isotope of oxygen as a tracer label to follow the fate of oxygen atoms during photosynthesis.
Light-dependan ...