Browse Items (1651 total)

Hand Sample:

Rock is comprised almost entirely K-Feldspar.

Dark gabbro dike separating ijolite and uncompahgrite

Hand Sample:

All weathered faces of the rock show heavy traces of oxidation.

Iron rich Carbonatite.

Partially serpentinized Olivine Gabbro.

Spilitized pillow basalt with overprinted prehnite-pumpellyite facies metamorphism. Arborescent ophitic to spherulitic texture; ablitized and saussuritized plagioclase, chloritized glass matrix, with occasional epidote.

Partially serpentinized tectonic lherzolite. Occasionally newly formed diopside may be noted.

Traces of oceanic metamorphism in greenschist-amphibolitic facies and weak overprint in prehnite-pumpellyite facies.
Metamorphic oceanic paragenesis: dark hornblende, actinolite, chlorite, oligoclase-albite in microfractures or reaction rims on…

Dioritic gabbro with deformational oceanic metamorphism of amphibolitic to greenschist facies and overprinting of prehnite-pumpellite.
Primary phases: plagioclase, clinopyroxene, olivine, ilmenite. Oceanic metamorphic paragenesis: plagioclase,…

Tectonic-sedimentary breccia of serpentinite modified by hydrothermal events in oceanic environment.

Rhodingitized gabbro dike in serpentinite. Chlorite, hydrogrossularia, diopside, prehnite, pumpellyite, vesuviane.

Basalt dike in gabbro with prehnite-pumpellyite overprint.

Peridotite, serpentinized, with plagioclase with harrisitic structure.

Serpentinized peridotite with plagioclase, olivine, plagioclase, clino-pyroxene, chromite. Secondary minerals include hydrogrossuaria as well as serpentine, chlorite, prehnite.

Hyaloclastite of basalt with superimposed metamorphism in pumpellyite-prehnite facies.

Serpentine (lizardite) with some structural deformation present.

Doleritic basalt with metamorphic overimprinting in prehnite-pumpellyite facies.
Primary minerals: plagioclase, titanaugite, ilmenite, olivine.
Metamorphic paragenesis: albite, pumpellyite, prehnite, sphene, chlorite.

Na-clinopyroxene (chloromelanite), almandine garnet, rutile, glaucophanic amphibole, harrisitic hornblende, epidote, ablite, chlorIte. Chloromelanite pseudomorphs on primary pyroxenes and chloromelanitic aggregates in plagioclase; granoblastic…

Gabbro with hydrothermal "oceanic" processes and prehnite-pumpellyite metamorphic overprint.
Plagioclase, clinopyroxene, olivine, ilmenite. metamorphic paragenesis: albite, sericite, chlorite, hematite, sphene, carbonates. Well-preserved relics of…

Antigorite, magnetite, carbonates (ankerite), diopside, clinohumite, tremolite, chlorite. Rarely, pseudomorphs on primary pyroxenes may be recognized, though there is superimposition of various deformational phases.