STUDY ON CALCIUM-OXALATE MONOHYDRATE RENAL UROLITHS .3. COMPOSITION AND DENSITY

Density and content of mineral constituents were determined for 33 hum an calcium oxalate monohydrate (hereafter COM) uroliths whose external appearance and inner structure were described in part I and II respec tively. Studied stones contained 0.13-0.42 wt. % of struvite, 0.68-4.1 2 wt. % of hydroxyapatite, 73-96 wt.% of COM and 3-10 wt.% of water un bound in a crystallohydrate. 10 to 20 wt. % of calculus mass is not ac counted for by chemical analysis. Density of COM calculi varying betwe en 1.67 and 2.06 g cm(-3) is not a function of any single stone parame ter. Around 30% of stone volume is not occupied by crystalline compone nts. The mulberry stones of sedimentary origin contained higher amount of organic matter than papillar and mulberry stones displaying site o f attachment to epithelium.