Siderite with Quartz - Wheal Maudlin, England / United Kingdom - 7 x 3 x 7.5 cm / main crystal: 1.6 cm

Mineral: Siderite with Quartz
Locality: Wheal Maudlin, Lostwithiel, St Austell District, Cornwall, England / United Kingdom
Dimensions: 7 x 3 x 7.5 cm / main crystal: 1.6 cm

Description: Mass: 194 g MIM number:1874 Dark to pale brown "horse tooth" short prismatic crystals of siderite exhibiting concentric compositional zonation. This is a very rare crystal habit for siderite. Some white quartz crystals are also present. Photographer: AINU / Augustin de Valence Publication: “Mineralogical Record, Jul-Aug 2020” Ex collection Philadelphia Academy of Natural Sciences (USA)