Geology: Rock 'em
1:06
Geology: Rock 'em
Feb 28, 2020
PBS
What Are the Most Common Types of Igneous Rock Textures?
What Are the Most Common Types of Igneous Rock Textures?
11 months ago
thoughtco.com
Pegmatite, an igneous rock, hosts precious gems like emeralds, tourmalines, and aquamarines. Their large grains are rich in minerals, formed in specific conditions where magma cools slowly, organizing crystals into gem-filled formations. #Pegmatite #IgneousRock #Emeralds #Tourmalines #Aquamarines #Gems | Mineral Gemstones
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Pegmatite, an igneous rock, hosts precious gems like emeralds, tour…
446 views4 months ago
FacebookMineral Gemstones
Granite or Pegmatite? Picked from a field site, this coarse-grained rock shows pink feldspar crystals with shiny flakes of mica, classic features of a granitic material. The pink hue is from potassium feldspar (microcline/orthoclase), while the sparkle comes from muscovite and biotite. Such rocks form from slow cooling of magma deep in the crust, often marking continental crustal zones that may host rare metals or gem minerals in pegmatitic varieties. Possible rock type: Muscovite Granite or Peg
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Granite or Pegmatite? Picked from a field site, this coarse-grained roc…
434 views5 months ago
FacebookNC Gideon
Elemental composition of the sample : 1: Rock type and main minerals Very high Si (85,317 ppm ≈ 8.53 wt% Si; ~18 wt% SiO₂ , quartz-rich) and high Al (38,616 ppm) with very high K (30,102 ppm) → a K-mica–rich pelitic schist (muscovite ± biotite) with abundant quartz. The green colour plus Fe ~11,867 ppm and modest Ca suggests chlorite overprint on biotite (typical greenschist to lower amphibolite facies). Minor epidote is possible but Ca is not especially high. P (207 ppm) LREEs (Ce 319, Pr 373,
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Elemental composition of the sample : 1: Rock type and main mi…
7.1K views5 months ago
FacebookNC Gideon
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