All the geyser water in this district is so charged with silicious earths that it consolidates sufficiently rapidly to form an upright rim around each geyser's vent.
"A Girl's Ride in Iceland"
Ethel Brilliana Alec-Tweedie
I before alluded to the exquisite symmetry of the silicious and crystalline coverings of some of the simplest forms of marine animalcules; and also I may here add the beautiful colouring of shells sometimes on the inside.
"Creation and Its Records"
B.H. Baden-Powell
At first algae and low forms of vegetable life appeared; and doubtless we have lost myriads upon myriads of such lower forms of plant-life in the early strata, because such forms were ill calculated for fossil-preservation, owing to the absence of woody fibre, silicious casing, or hard fruit or seed vessels.
"Creation and Its Records"
B.H. Baden-Powell