Field evaluation of feldspar should pay special attention to twin observation.
野外鉴定长石时要特别注意双晶的观察。
Potassium feldspar is usually red meat, but there was purple, white, gray, or black.
钾长石通常是肉红色的，但也有呈紫红色、白色、灰白色，甚至灰黑色。
Potassium feldspar is usually red meat, but there was purple, white, gray, or black.
钾长石通常是肉红色的，但也有呈紫红色、白色、灰白色，甚至灰黑色。
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