Quartz, Haematitic, Dyfyngwm. (CWO)
Quatrtz, SiO2, Dyfyngwm mine, Nr.Staylittle,Central Wales. Brecciated rock with a vhug of small druzy crystals of quartz which have been coloured by haematite.
Quatrtz, SiO2, Dyfyngwm mine, Nr.Staylittle,Central Wales. Brecciated rock with a vhug of small druzy crystals of quartz which have been coloured by haematite.
Goethite, Iron oxyhydroxide, FeO(OH). and Pyrite, FeS2 Aberdaunant mine, Central Wales Orefield. Fractured country rock with small cubic Pyrite crystals and Quartz. Most of the Pyrite crystals are encrusted with Goethite which is common at this site.
Siderite, iron carbonate, FeCO3. Castell mine, West Wales. A small vugh of rhombohedral siderite crystals on a different face of the specimen in siderite 1. The crystals have an almost imperceptible curved face, and very faint striations.
Siderite, Iron carbonate, FeCO3. Castell mine, West Wales. A concretionary mass of small rhomohedral crystals. The crystals have curved, striated faces, and vary in colour from pale cream to light brown.
Quartz, SiO2, Aberdaunant mine, Central Wales orefield. Small prismatic crystals in druzy form, with varying degrees of hematitic colouration, from pale red to yellowish brown.The reddish colour is caused by trace elements of Iron, incorporated during crystal growth.