Hi, welcome to the ehealth forum and I am glad to help you.
You seem to be concerned about the size and shape of kidney stones. Most of the stones less than 4 mm will pass spontaneously in urine without the need for any intervention and stones greater than 6 mm in size may require intervention.
The most common type of kidney stone is composed of calcium oxalate and calcium phosphate crystals, occurring in about 80% of cases. Cystine crystals in urine appear as flat, hexagonal plates. Struvite stones appear in the urine as rectangular prisms resembling coffin lids. A stone can traverse the urinary tract without symptoms but the passage usually produces pain and bleeding. Straining the urine(by urinating through a tea strainer or stonescreen) allows collection of the stone when it passes.
Hope this helps. Take care.
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