Assertion: sponge's spicule | /r/HasProperty | siliceous
Facets:
Source sentences:
text: Bath sponges are made of calcereous or siliceous spicules, and they are therefore soft to the touch.
text: These sponges have siliceous spicules (no triaxonic), sponging or both.
text: Most sponges today are in this class 2. composed of spongin fibers and siliceous spicules 3.
text: Spicules are either calcereous (precipitated from calcium ions and carbonate ions) or siliceous (precipitated from silicate salts).