Pair of Calcareous Sponges – Natural Marine Specimens – Philippines A beautiful pair of calcareous sponges (Class Calcarea), collected from the shallow coral reefs of the Philippine archipelago. These rare marine formations are composed entirely of calcium carbonate, giving them a fossil-like solidity and texture once dried. Each specimen displays a unique organic structure — with undulating ridges, natural openings, and subtle tonal variations ranging from sand to warm coral hues. Their sculptural, vessel-like forms highlight the complexity and elegance of marine life’s natural architecture. Untreated and in their natural state, these pieces exemplify the quiet beauty of oceanic biodiversity. Perfect for a natural history collection, museum display, or refined coastal décor. Measurements: Specimen A: 350 g – 15.5 × 13 × 12.5 cm Specimen B: 230 g – 17.5 × 16 × 8 cm