Inesite

Inesite

Inesite, is a complex inosilicate mineral, with a formula Ca2Mn7Si10O28(OH)2 . 5 To give it a full title, it is a hydrous calcium manganese silicate. The appearance of the specimen is true to type with prismatic pink coloured crystals, with chisel shaped terminations. The specimen is from Kuruman in South Africa.  

Calcite

Calcite

Calcite, Calcium carbonate, CaCO3  This simple specimen is part of a larger druse of scalenahdral crystals on a limestone base. The crystals are well formed and have a colour which could be called light cream. The origin is Colemans limestone quarry, Mendip hills, Somerset.

Hematite

Hematite

Hematite, Fe2O3, Iron oxide, This specimen, because of it's silvery appearance, can sometimes be labelled as micaceous hematite. This can be misleading, because there is no mica content. The specimen is from Bamfylde mine in Devon.

Goethite

Goethite

Goethite is an iron bearing hydroxide mineral. a- FeO ( OH ). This specimen has a vugh of acicular goethite crystals. set into a small piece  of hematite. It was collected  from Ton Mawr quarry, near Cardiff, South Wales.UK.

                         

Calcite

Calcite

Calcite, calcium carbonate, CaCO3   I discovered this unusual geode in an excavation for industrial buildings in Bridgenorth, Shropshire. The excavation was in sandstone which is predominant in Bridgenorth. The outer shell of the geode is composed of rounded and angular sandstone grains of sizes from .5 mm to 3mm set in a calcite cement. The main core is massive calcite, and the crystals of calcite in the centre are mainly indistinct crystals, but with a few obsevable scalenohedral crystals, nearly all with a brown coating.