Biotite

ncat RD Diopside, Fluorapatite, Nepheline, Ilmenite, Magnetite, Leucite, Sanidine, Biotite, Clinopyroxene, Cosgrove quarry, Cosgrove, City of Greater Shepparton, Victoria

(Photo) Leucite as grey-white material in groundmass (“leucitite”). Elsewhere on specimen: Green prismatic diopside. Brown-black prismatic clinopyroxene. Nepheline as hexagonal prisms. Nepheline with hollow cores have been altered to analcime. Colourless needles of fluorapatite. Grey ilmenite as flat crystals. Magnetite as tetrahedrons. Colourless tiny tabular sanidine crystals. Brown pseudohexagonal biotite....

March 9, 2025

Europe Germany

2632 Zircon, Biotite, Sodalite, Sanidine, In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Greenish-grey zircons with black inclusions and tiny colourless crystals (sanidine?) sprinkled on terminations, and as most of the matrix. The sanidine fluoresces pink under shortwave UV. Associated with black “biotite” and orange fluorescing sodalite under longwave UV. Width of view 6mm. Stack of 100 images (white light), 9 images (LWUV)....

July 20, 2024

Australasia Australia South Australia Type Locality

3082 Francevillite, Carnotite, Davidite-(La), Biotite, Radium Hill, South Australia

Yellow material labelled as francevillite or carnotite, on davidite-(La). It is most likely carnotite but would need analysis to confirm. Width of view 11.5mm. Stack of 50 images. Click on the image below for a higher resolution version.

July 2, 2023

Europe Hungary

ncat JP875 Chabazite-Ca, Analcime, Biotite, Saponite, Csódi Hill, Dunabogdány, Szentendre, Pest Co., Hungary

Pink twinned rhombohedral chabazite with colourless analcime. Tiny green spots of saponite (towards the bottom left for example) and biotite phenocrysts (not in photo) also present. Some of the chabazites exhibit an unusual stack-like habit (towards the bottom left). Ex Jo Price Collection. Width of view 11.5mm. Stack of 35...

June 29, 2022

Australasia Australia South Australia

7344 JL3134 Beryl, Titanite, Biotite, Monazite, Magnetite, Tungkillo area, Palmer, South Mt Lofty Ranges (Adelaide Hills), Mt Lofty Ranges, South Australia

Acquired by Joan Lamond from Judy Rowe in 1998. Labelled as “Mannum”.

December 25, 2020

Australasia New Zealand

5690 Zircon, Biotite, Taratimi Bay (Crater Bay), Mayor Island (Tuhua), Bay of Plenty Region, North Island, New Zealand

Sharp and very thin crystals of biotite with white concertina zircon crystal (indicated by red arrow). Width 5.5mm. Stack of 100 images.

July 14, 2020

Europe Germany

9118 JP2620 Pseudobrookite, Nepheline, Fluorapatite, Biotite, Rhonite, Nickenicher Sattel (Eicher Sattel), Nickenich, Andernach, Eifel, Rhineland-Palatinate, Germany

Sharp black prismatic pseudobrookite, colourless hexagonal nepheline, white fluorapatite, brownish biotite, single reddish rhonite. Width 2.77mm. Stack of 16 images. Ex Jo Price Collection.