Fig. 14. Thermograms showing direct thermogravimetrical (TG; milligrams), differential thermogravimetrical (DTG; arbitrary units), and differential thermo−analytical (DTA; arbitrary units) curves of synthethic aragonite (A) and three samples with two different nanostructural patterns: Triassic Pachysolenia cylindrica (B) without distinct nanograins; Jurassic Isastraea cf. bernensis (C) and Recent Favia stelligera (C) with well developed nanograins. Assumed amount of intraskeletal hydrated organic components was calculated based on distinct weight loss of 400 mg sample that occurred at ca. 300–450°C.