Onyx

Feem ntau onyx totaub cov moj bis, tsis tau yog ib pob zeb ho muaj ntau yam. Onyx no sedimentary pob zeb, ua raws li cov stalactites thiab cov stalagmites nyob rau hauv lub qhov tsua interiors. No tsim kom muaj txoj kev soj ntsuam nyob hauv lub cryptocrystalline siv lub pob zeb ntaub, thiab nws yog tus loj thiab uniformity ntawm cov muaju uas ua rau kom classic translucent thaj ntau hom onyx. Thaum raug heev rau cov tshuaj thiab abrasive nres, cov hniav nyom xub ntxiv ntawm onyx yog kab tias unsurpassed yog muaj lwm yam khoom siv.