- May 28, 2010
- 19,749
- 31,084
- 🥇 Banner finds
- 1
- 🏆 Honorable Mentions:
- 1
- Detector(s) used
- Nokta Makro Legend// Pulsedive// Minelab GPZ 7000// Vanquish 540// Minelab Pro Find 35// Dune Kraken Sandscoop// Grave Digger Tools Tombstone shovel & Sidekick digger// Bunk's Hermit Pick
- Primary Interest:
- Metal Detecting
Can you correctly identify the meteorite in this photo. It is an L4 Ordinary Chondrite - [FONT="]The recommended classification [/FONT]L4[FONT="] means: [/FONT][FONT="]"An [/FONT][FONT="]ordinary chondrite[/FONT][FONT="] from the [/FONT][FONT="]L group[/FONT][FONT="] that is petrologic [/FONT][FONT="]type 4[/FONT][FONT="]." [/FONT][FONT="]The highlighted words are defined as follows:[/FONT][FONT="]
ordinary chondrite: A major class of chondrites, distinguished by sub-solar Mg/Si and refractory/Si ratios, oxygen isotope compositions that plot above the terrestrial fractionation line, and a large volume percentage of chondrules, with only 10-15 vol% fine-grained matrix.[/FONT]
[FONT="]L group: The low-iron (L) chemical group of ordinary chondrites, distinguished by their relatively low siderophile element content, moderate sized chondrules (~0.7 mm), and oxygen isotope compositions that intermediate between H and LL group ordinary chondrites.[/FONT]
[FONT="]type 4: Designates chondrites that are characterized by abundant chondrules, and have been metamorphosed under conditions sufficient to homogenize olivine compositions and recrystallize fine-grained matrix. Some of the low-Ca pyroxene grains may be monoclinic and exhibit polysynthetic twinning. Primary igneous chondrule glass is absent. Meteoritical Bulletin: Recommended classifications
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ordinary chondrite: A major class of chondrites, distinguished by sub-solar Mg/Si and refractory/Si ratios, oxygen isotope compositions that plot above the terrestrial fractionation line, and a large volume percentage of chondrules, with only 10-15 vol% fine-grained matrix.[/FONT]
[FONT="]L group: The low-iron (L) chemical group of ordinary chondrites, distinguished by their relatively low siderophile element content, moderate sized chondrules (~0.7 mm), and oxygen isotope compositions that intermediate between H and LL group ordinary chondrites.[/FONT]
[FONT="]type 4: Designates chondrites that are characterized by abundant chondrules, and have been metamorphosed under conditions sufficient to homogenize olivine compositions and recrystallize fine-grained matrix. Some of the low-Ca pyroxene grains may be monoclinic and exhibit polysynthetic twinning. Primary igneous chondrule glass is absent. Meteoritical Bulletin: Recommended classifications
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