â¢ Apply primer to any knots or resin pockets on the trim. â¢ Let the primer dry, and then begin masking all adjacent surfaces with painter's tape. Be sure to seal the edges firmly. â¢ Wipe down the surface with denatured alcohol or a paint deglosser then prime the entire surface with a stain-blocking primer.
K-feldspar and plagioclase feldspar Feldspars have two cleavage planes that intersect at 90Â°. Fragments of pure feldspar crystals thus tend to form rectangular blocks with irregular ends. Feldspars have vitreous lusters and occur in opaque shades of white to gray to pink to very dark gray.Other rarer colors are also possible! The feldspars are divided into two main groups: Potassium feldspar (K-spar) and plagioclase (plag).-feldspar and plagioclase feldspar Feldspars have two cleavage planes that intersect at 90Â°. Fragments of pure feldspar crystals thus tend to form rectangular blocks with irregular ends. Feldspars have vitreous lusters and occur in opaque shades of white to gray to pink to very dark gray.
Typically, potassium feldspars tend to have more pink and reddish hues, while plagioclase minerals usually range from white to gray. However, the hues of both mineral groups overlap, so color is seldom definitive.uartz: Quartz is a common mineral in many metamorphic and felsic igneous rocks that, like the potassium feldspars, also has a non-metallic luster and hardness greater than glass. Unlike the potassium feldspars, however, quartz does not exhibit cleavage, which easily distinguishes it from feldspar minerals.