Gneiss

Gneiss is a type of metamorphic rock, which has been subjected to very high-temperatures and pressures. It is formed by the metamorphosis of granite or sedimentary rock and displays alternate layers of different minerals. Our gneiss, from the Isle of Lewis in North-west Scotland, is among the oldest rocks in the UK. Hardness 6-7 (Mohs).

16 Items
Lewisian Gneiss Cabochon 29.5mm
£13.00
Lewisian Gneiss Cabochon 30.25mm
£12.55
Lewisian Gneiss Cabochon 31mm
£12.75
Lewisian Gneiss Cabochon 32mm
£13.80
Lewisian Gneiss Cabochon 33.25mm
£14.55
Lewisian Gneiss Cabochon 33.25mm
£13.45
Lewisian Gneiss Cabochon 33.5mm
£12.80
Lewisian Gneiss Cabochon 33.5mm
£13.35
Lewisian Gneiss Cabochon 33.75mm
£13.15
Lewisian Gneiss Cabochon 33mm
£13.55
Lewisian Gneiss Cabochon 34.25mm
£13.15
Lewisian Gneiss Cabochon 34.5mm
£13.95
Lewisian Gneiss Cabochon 35mm
£13.20
Lewisian Gneiss Cabochon 36mm
£14.25
Lewisian Gneiss Oval Cabochon 10mm x 8mm
£5.00
Lewisian Gneiss Oval Cabochon 18mm x 13mm
£13.10