by Gelogia Team | Mar 5, 2025 | Geology, Petrology
Conglomerate is a sedimentary rock formed from rounded pebbles or clasts held together by a finer matrix. Its classification depends on pebble composition, sorting, and matrix abundance. Well-sorted conglomerates signify gradual deposition by water currents, while...
by Gelogia Team | Mar 3, 2025 | Petrology
Gravel: Gravel is an unconsolidated accumulation of rounded fragments greater than 2 mm in diameter. Wentworth (1922) classified gravel into four types on the basis of size (diameter in mm) (a)...
by Gelogia Team | Feb 12, 2025 | Petrology
Intergrowth texture forms when two minerals crystallize together or through exsolution in igneous rocks. Common types include graphic, myrmekite, exsolution, cavity, radiate, reaction, and pegmatite textures, each revealing mineral interactions and cooling history....
by Gelogia Team | Feb 10, 2025 | Petrology
Types of Metamorphic Texture form due to varying pressure and temperature conditions. They are classified into foliated (slaty, schistose, phyllitic, gneissic) and non-foliated (granulose, mylonitic, hornfelsic) textures. Other textures like augen, porphyroblastic,...
by Gelogia Team | Feb 8, 2025 | Petrology, Structural Geology
What are Metamorphic Facies? A metamorphic facies consists of metamorphic mineral assemblages that repeatedly develop in rocks with various bulk chemical compositions across different locations and times, reflecting specific metamorphic conditions. If a rock forms...
by Gelogia Team | Feb 1, 2025 | Petrology
Types of Protoliths: The following rock properties allow the recognition of protoliths: Relict fabrics: In low-grade metamorphic rocks where recrystallization has not created large new grains or substantial deformation has not taken place, boundaries of original...
