Browse Items (1651 total)

Mineralogy: quartz, feldspar, biotite, staurolite. Foliated. Foliation caused by biotite, staurolite is porphyroblastic. Biotite-staurolite-schist. Staurolite Zone.

Macroscopic: Biotite, muscovite schist. Parts of the outcrop are migmatic as a result of intrusion by various phases of the Port Mouton Pluton. Microscopic: Coarse grained biotite, muscovite and quartz. Thin section pictures in XPL unless otherwise…

Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, plagioclase, alkali feldspar, and quartz. Hand sample shows slight discoloration (orange tinge) from weathering of an iron oxide, a high concentration of biotite, quartz, and…

Macroscopic: Porphyroblastic staurolite, andalusite, cordierite, garnet, biotite, chlorite, muscovite schist. Cross bedding or graded bedding may be apparent in some samples. Mineral zone: staurolite-andalusite. Microscopic: Large garnet phenocrysts…

Gneiss from the Bethlehem Gneiss series. Thin section contains plagioclase, alkali feldspar, biotite, quartz, and muscovite. Hand sample contains feldspars, quartz, and micas.

Gneiss from the Bethlehem Gneiss series. Coarser grained. Thin section contains biotite, muscovite, quartz, plagioclase, and alkali feldspar. Hand sample is coarser than NH-3 and contains quartz, feldspars, and micas. From the same locality as NH-4.

Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, muscovite, quartz, and plagioclase. Hand sample is finer grained than NH-3 and contains feldspars, quartz, and micas. From the same locality as NH-3.

Granite from the Concord Granite series. Thin section contains plagioclase, alkali feldspar, biotite, quartz, and muscovite. Hand sample shows feldspars, quartz, and micas.

Gneiss from the Bethlehem Gneiss series. Thin section contains quartz, biotite, plagioclase, and muscovite. Hand sample is a leucocratic facies and contains quartz, feldspars, and micas.

Garnet Gneiss from the Kinsman Quartz Monzonite. Thin section contains large alkali feldspar porphyroblasts, plagioclase, biotite, muscovite, garnet, and quartz. Hand sample is coarse grained and cataclastic, and contains plagioclase, bitote,…

Leucocratic facies of the Kinsman Quartz Monzonite. Thin section contains plagioclase, bitote, quartz, alkali feldspar, and muscovite. Hand sample shows feldspars, quartz, and biotite. Taken from the same location as NH-7.

Macroscopic: Mega-porphyroblastic andalusite, cordierite, staurolite, biotite, garnet schist. Relict bedding, cross bedding or graded bedding may be apparent in some samples. Mineral zone: staurolite-andalusite. Microscopic: Large garnet phenocrysts…

Quartz Monzonite from the Kinsman Quartz Monzonite series. The garnets show definite zoning, with some zones up to 1.0mm thick. Thin section is garnet rich and also contains plagioclase, quartz, alkali feldspar, some biotite, and muscovite. Hand…

Granite from the Spaulding Quartz Diorite. Thin section contains plagioclase, biotite, quartz, alkali feldspar, some garnet, and sillimanite. Hand sample shows quartz, feldspars, sillimanite, and mica.

Hypersthene Quartz Diorite from the Spaulding Quartz Diorite. Thin section contains pyroxene, quartz, biotite, plagioclase, and alkali feldspar. Hand sample shows micas, quartz, feldspars, and pyroxene.

Spotted Spaulding Granite, member of the Spaulding Quartz Diorite. Part of an irregular sill, not the major facies. Spotted appearance, extends through more mafic facies. Thin section contains quartz, alkali feldspar, plagioclase, mica, and…

Ferrohypersthene Garnet Biotite Tonalite from the Spaulding Quartz Diorite. Some samples are fairly weathered. Thin section contains garnet, biotite, quartz, and plagioclase. Hand sample shows garnet, biotite, quartz, feldspars, and evidence of…

From the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, biotite, and muscovite. Hand sample is finer grained and contains feldspars, quartz, and micas.

Coarse grained sample from the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, and muscovite. Hand sample is a coarse granite with quartz, feldspars, and muscovite.