Feldspar Lumps
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We are offering feldspar lumps. Feldspars are considered relatively hard minerals, and as such can often be identified by their hardness. The minerals maintain a hardness of six on the mohs scale. To give a better understanding, this is a hardness between a steel knife and quartz. While feldspars usually maintain a white (or near-white) colouring, they can often appear clear or as lighter shades of orange and pink. Feldspar samples will often have a glassy luster. As feldspar is considered a rock-forming mineral, the mineral is often responsible for a large part of a rock’s composition. It is worth noting that quartz is often confused with feldspar in rock samples. While the minerals maintain a relatively similar hardness, they have a different breakage. While quartz breaks in irregular shapes (conchoidal fracture), feldspar breaks along flat faces (cleavage). The feldspar mineral maintains a perfect cleavage, and will easily break into ‘rhombs’.