Suppose, fine white sand for foundation works ( mostly 0.2-0.5 mm size) is sieved; sand finer than a typical flour screen is screened out; and coarser than meshed plastic food-covering lid is also discarded. The fraction retained is richer in platy mica, cheifly muscovite and some biotite. Still significant amount of silica sand with some feldspar, apatite and baked metakaolin were retained.

This mica-enriched sand (50-200g) was washed by tap water, dried under sun, then put onto a black deep cast iron bowl and heated with full-strong flame of a typical household gas oven, under ambient atmospheric gases. Significant amount of Mono-ammonium phosphate (MAP)nodules were added (about 80-100 granules of fertilizer size), and stirred with a wooden stick until pungent gas evolution from the mixture ceased). The mixture then was cooled and crushed.

The crushed mixture was mixed with 5% ethanoic acid (vinegar grade) solution. Soon a milky-white precipitate formed, and gradually a clear solution also formed. The clear solution layer war decanted, and dried to a beige-brown clumpy powder. with waste heat from the same gas oven. At the cast iron pot's inner side just above "molten" mica-MAP line, a golden-glittery rim was formed.

My questions are-

Provided are figures of the screen, and sample of the mica-enriched sand.

Note, the processing is aimed to be exclusively done by cheap household/agricultural/natural products