Troktolit
Troktolit (někdy označována jako pstruhovec) je ultramafická intruzivní magmatická hornina, která je tvořena převážně plagioklasem (labradorytem či bytownitem), alkalickými živci (zejména K-živcem) a olivínem.[1] Jedná se o přechodnou horninu mezi peridotitem a anortitem.
Hornina je nejčastěji šedočerná s častým nazelenalým odstínem. Jelikož hornina vznikala postupným chladnutím, má všesměrnou zrnitost střední až hrubé velikosti. Na území Česka byly troktolity pozorovány v oblasti Ranského masívu.
Odkazy
Reference
- ↑ Poznávání hornin - troktolit [online]. Přírodovědecká fakulta Univerzity Karlovy, sekce Geologie [cit. 2009-02-03]. Dostupné online.
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Troctolite76535.jpg
Troctolite sample 76535 brought back from the Moon by Apollo 17. This sample has a mass of 156 grams and is up to 5 centimeters across. It was collected as part of a rake sample at station 6 at the foot of the North Massif.
Another view of this sample was used in Figure 7-16 of the Apollo 17 Preliminary Science Report (SP-330, 1973), which has the following caption:
Coarse-grained norite (sample 76535) with fresh-appearing plagioclase (white to light gray) that has typical striations of albite twinning. Although pyroxenes (medium gray) are fractured along cleavage planes, they do not appear badly crushed.
Troctolite sample 76535 brought back from the Moon by Apollo 17. This sample has a mass of 156 grams and is up to 5 centimeters across. It was collected as part of a rake sample at station 6 at the foot of the North Massif.
Another view of this sample was used in Figure 7-16 of the Apollo 17 Preliminary Science Report (SP-330, 1973), which has the following caption:
Coarse-grained norite (sample 76535) with fresh-appearing plagioclase (white to light gray) that has typical striations of albite twinning. Although pyroxenes (medium gray) are fractured along cleavage planes, they do not appear badly crushed.