Rocks & Minerals in the Kaiserstuhl
 
Leucite-tephrite, Niederrotweil

Tephrite
basic volcanic rock, with  a vitreous groundmass;
most frequent rock in the Kaiserstuhl volcanic complex;
Häufigstes Gestein im Kaiserstuhl
main constitutes: plagioclase, leucite, Ti-augite 
accessory: K-feldspar, analcime, magnetite, apatite zircon, melanite

thin section under plane polarized light
image width 3,7 mm
vitreous matrix
thin section under crossed polarized light
image width  3,7 mm
twinned Ti-augite, with nice zoning and sandglass structure
Essexite, Schelingen
basic subvolcanite from the central Kaiserstuhl.
main constitutes: plagioclase, Ti-augite
accessory: K-feldspar, magnetite, apatite, zircon
thin section under plane polarized light
image width 3,7 mm
thin section under crossed polarized light
image width  3,7 mm
Ti-augite with oszillation zonation,
plagioclase, magnetite
Limburgite, Limberg, Sasbach
primitive igneous rock with vitreous groundmass and mafic phenocrysts,
vesicles are filled with zeolites (faujasite, phillipsite,..) and other secondyra minerals  
main constitutes: Ti-augite, olivine, 
accessory: magnetite, ilmenite
secondary minerals: calcite, aragonite, zeolites
thin section under plane polarized light
image width 3,7 mm
augite phenocryst in vitreous matrix (stilpnomelane)

thin section under crossed polarized light
image width  3,7 mm
Ti-augite with oszillation zonation,
plagioclase, magnetit
Soevite (carbonatite) Orberg, Schelingen
volcanic limestone from the central Kaiserstuhl
main constitutes: calcite
accessory: magnetite, olivine, apatite, phlogopite, koppite 
thin section under plane polarized light
image width 3,7 mm
koppiet: brown mineral beside isotrop magnetite

thin section under crossed polarized light
image width  3,7 mm
Carbonatite-lapilli, Henkenberg,
Niederrotweil
extrusive carbonatitic lapilli stone
main constitutes: calcite
accessory: apatite
thin section under plane polarized light
image width 3,7 mm
thin section under crossed polarized light
image width  3,7 mm
Faujasite (zeolite), Limberg, Sasbach
faujasite with offreite and phillipsite
image width 10 mm