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To make fake asteroid dirt, technicians mix various minerals — including bronzite, which is sourced from jewellery suppliers as polished stones — compress them into bricks and then pulverize them.

Frances Bronzite, 64, is visiting Golders Green from her home in Redbridge, Essex, to buy supplies for her son's engagement party.

Mrs Bronzite says it is not just the threat of Islamist extremism that worries her, but also what she sees as a rise in right-wing anti-Semitism.

Bronzite and hypersthene were known long before enstatite, which was first described by G.A.

Other minerals which have been found in eclogites are bronzite, olivine and glaucophane.