Siliceous volcanic glass is also known as obsidian.
Amorphous siliceous(silica contain)hard parts mostly found in radiolaria and heliozoa.
It is a mixture of water and the silica shell remains of marine plankton.
The mantle does not contain free Iron or Nickel. It is made of siliceous minerals.
Chert is a cryptocrystalline siliceous sedimentary rock. It resembles the physical properties of rocks having a glassy texture and a conchoidal fracture.
Siliceous volcanic glass is also known as obsidian.
Amorphous siliceous(silica contain)hard parts mostly found in radiolaria and heliozoa.
biogenous
Calcareous ooze is composed of calcium carbonate, while siliceous ooze is made from silicon oxide.
The rock tripoli is considered a siliceous limestone, as most of the calcium carbonate has been weathered out or baked out by proximity to a plutonic intrusion.
We know that limestone is made up of those things, and some others. We also know that chalk, a kind of limestone, is composed mainly of tiny shells made of a mineral called calcite.
siliceous mineral
quartz, feldspar, and mica.
Siliceous
Siliceous
Siliceous volcanic glass is also known as obsidian.
I think it is just that. They are algae with a siliceous case. Others correct if necessary.