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20 answers for: Old hard form of silica surrounds geographical fea...
RANKANSWERCLUE
HISTORICALOld hard form of silica surrounds geographical feature
HARBINHard form of support rising because of Chinese capital
AGATEAn ornamental stone consisting of a hard form of chalcedony (5)
CORUNDUMHard form of alumina
FLINTHard form of quartz
AMETHYSTHard form of conundrum that loses its point
DIAMONDVery hard form of carbon (7)
OPALForm of silica, opaque or transparent with an iridescent play of colours valued as a gem
CHERTHard microcrystalline or cryptocrystalline form of silica resembling, and sometimes synonymous with, flint (5)
OPALINELike a form of silica
QUARTZCommon mineral that's a form of silica
CHALCEDONYForm of silica with the varieties chrysoprase and agate (10)
SIALICForm of silica in earth's crust
AGATESForms of silica used by a computer expert (6)
DOUGHTook note of trousering old hard cash?
TROJANHORSESOld hard-working guy from Arabian school programmes compromising security (6,6)
BODICERIPPERBlack, old, hard water in faulty tap? It's steamy!
EXHIBITDisplay old hard part I brought in (7)
OHMOld hard Frenchman joins resistance unit (3)
CLOGDANCINGThe old hard shoe?