Siderite from Panasqueira Mines, Portugal - image 1
Siderite from Panasqueira Mines, Portugal - image 2
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Siderite from Panasqueira Mines, Portugal

$120.00

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Lustrous slightly translucent crystal of cassiterite measuring 1.3 x 1.2 x 0.7 cm in size along one edge of a siderite and quartz crystal covered matrix. In good condition. Nice example for the species and locality. The specimen comes with a previous label from the Alton collection. The Panasqueira Mines in Beira Baixa, Portugal, opened in 1898 and, aside from a brief temporary closure in 2003, remain actively in operation today. Geologically, the deposit is hosted within a sequence of late Precambrian to Cambrian metasedimentary rocks, primarily consisting of greenschist-facies shales, slates, and greywackes of the Beira schist formation. The mineralization occurs as a sub-horizontal system of quartz veins rich in tungsten, tin, and copper, which are genetically related to an underlying hidden Hercynian granitic pluton emplaced during the Late Carboniferous period.

Product details

SpeciesSideriteCassiterite
SizeSmall Cabinet
Dimensions6.5 x 5.5 x 2.5 cm
Listed on11/07/2026
LocalityPortugal, Panasqueira Mines
SKU8911126

Current owner

WM
Weinrich MineralsFeatured
3,650 for sale·9 sold

Learn more

Siderite
Mineral guide
Learn about Siderite
warm-toned iron carbonate with sharp rhombohedra and occasional gemmy crystals; prized for luster, classic localities Harz, Panasqueira, Dal’negorsk.
Siderite
Regional guide
Siderite from Panasqueira Mines, Portugal
from Panasqueira, Portugal — lustrous tan to cream rhombohedra in rosettes and masses; a world-class, modern classic from a magmatic-hydrothermal vein.
Locality guide
Panasqueira Mines
Panasqueira Mines, Portugal — premier locality yielding tungsten, ferberite, arsenopyrite, fluorapatite, and colorful quartz associations prized by collectors.