似长石（feldspathoid）是指化学组成与长石相似，金属阳离子为钾、钠或钙，但Si/Al比值小于3的一些无水架状结构铝硅酸盐矿物的总称。
讲稿详细地介绍了火成岩矿物，如：石英及它的同构异形体、柯石英、鳞石英、方石英、长石、斜长石、似长石、辉石、闪石等矿物。
The notes describe the common minerals such as quartz and its polymorphs, coesite, tridymite and cristobalite, feldspar, plagioclase, feldspathoids, pyroxenes, amphiboles, etc.
当钾长石在斑状、似斑状岩石中构成斑晶时，常呈板状、板柱状自形的晶体。
When the potassium feldspar phenocrysts in porphyritic porphyritic rocks, like in form, often with a plate, plate columnar euhedral crystals.
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