dedolomite Limestone formed by the replacement of dolomite by calcite in a carbonate rock. This replacement occurs mainly when a dolomite is flushed through by meteoric or sulphate-rich waters. A characteristic feature of dedolomite is the presence of dolomite-shaped, rhombohedral crystal forms now occupied by calcite pseudomorphs.
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Blasto- , blasto- A prefix applied to textural terms and used to indicate the partial or complete replacement of a textural element in the original rock by cry… Pseudomorph , pseudomorph A secondary mineral or a random aggregate of secondary minerals (monomineralic or polymineralic) which have replaced an earlier mineral b… Sedimentary Rock , Sedimentary rocks form at or near Earth’s surface from the weathered remains of pre-existing rocks or organic debris. The term sedimentary rock appli… Leucite , leucite An important feldspathoid mineral KA1Si2O6; sp.gr.2.5; hardness 5.5–6.0; tetragonal; normally white or grey; vitreous lustre; crystals form v… Amphibole , amphibole Any of a large group of complex rock-forming minerals characterized by a double-chain silicate structure (Si4O11). They all contain water a… Geode , Geode Geodes are hollow rock masses that are lined with crystals that have grown toward the center of the cavity. Geodes are usually roughly spherica…
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