Having a structure made of both fibrous strands and crystalline minerals arranged together.
From 'fibro-' (fiber) + 'crystalline' (from Latin 'crystallus', ice or crystal, referring to ordered atomic structure). Geological and mineralogical term.
Many gemstones and valuable minerals like jade and tourmaline have this combined structure, which is why they're strong enough to cut into jewelry without shattering like purer crystals would.
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