Description
Natural Stannite Crystal Specimen from Cligga Head, Cornwall
This Stannite crystal specimen from Cligga Head, Perranporth, Cornwall represents a classic mineral locality from one of Britain’s historically important mining regions. The specimen has been carefully selected for its mineral character, natural crystal structure, and geological interest, making it a notable addition to mineral collections focused on Cornish mining heritage and rare sulfide minerals.
The crystal shown in the listing photographs is the exact specimen you will receive, allowing collectors to clearly examine the mineral’s surface texture, crystal habit, and overall form. Please refer to the listing photos for full sizing and scale of the specimen.
This specimen includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the mineral is a genuine natural specimen.
Mineral Species and Chemical Composition
Stannite is a tin copper iron sulfide mineral with the chemical formula Cu₂FeSnS₄. It belongs to the sulfide mineral group and is an important ore mineral of tin in certain hydrothermal mineral deposits.
The mineral crystallises in the tetragonal crystal system, although well-formed crystals are relatively uncommon. Stannite more frequently occurs as massive aggregates, granular crystals, or disseminated grains within mineral veins.
Because of its complex chemical composition containing copper, iron, tin, and sulfur, stannite forms in association with a range of other metallic sulfide minerals within hydrothermal ore systems.
Physical Properties and Appearance
Stannite typically displays a metallic appearance with a dark colour that can resemble other sulfide minerals. Its distinctive chemistry and mineral associations help distinguish it within ore deposits.
Typical mineral properties include:
• Mineral Species: Stannite
• Chemical Formula: Cu₂FeSnS₄
• Mineral Group: Sulfides
• Crystal System: Tetragonal
• Colour: Steel-grey to dark brownish-black
• Transparency: Opaque
• Lustre: Metallic
• Mohs Hardness: Approximately 4
Stannite may exhibit submetallic reflections and granular crystal structures, particularly when observed under strong lighting. In some specimens, crystal faces may show subtle reflective surfaces that highlight the mineral’s metallic character.
Geological Formation and Ore Deposit Environment
Stannite forms primarily in hydrothermal mineral veins, where metal-rich fluids circulate through fractures within host rocks. These fluids deposit sulfide minerals as temperature and pressure conditions change during the cooling process.
In tin-bearing hydrothermal systems, stannite may occur alongside a range of associated minerals including:
• Cassiterite
• Chalcopyrite
• Pyrite
• Sphalerite
• Arsenopyrite
These mineral assemblages are commonly found in regions with a history of tin mineralisation and granite-related hydrothermal activity.
Cligga Head and Cornish Mining Heritage
Cligga Head near Perranporth in Cornwall is a well-known historic mineral locality, associated with the extensive mining industry that once dominated the region. Cornwall’s geology is particularly rich in tin and copper deposits related to granite intrusions and hydrothermal mineralisation.
The Cligga Head area has produced a variety of mineral species connected with tin and copper ore formation. Specimens from this locality are sought after by collectors interested in British mineral localities and historic mining regions.
Cornwall’s mining landscape is internationally recognised for its geological importance, and minerals from these localities represent a tangible connection to the region’s industrial and geological past.
Collecting and Display Value
Stannite specimens are valued by mineral collectors due to their association with tin ore systems and their relative rarity compared with more common sulfide minerals. Specimens from historic British localities are particularly desirable for collections focusing on regional geology or mining heritage.
This specimen is suitable for:
• Mineral collections
• British locality collections
• Mining heritage displays
• Geological study collections
• Educational mineral displays
Each specimen reflects the unique geological processes that formed the mineral within hydrothermal ore veins, resulting in natural variations in crystal habit, metallic lustre, and mineral associations.
Cultural and Historical Context
Minerals associated with historic mining regions often carry cultural significance due to their connection with centuries of mining activity and industrial development. Cornwall in particular has played a major role in global tin mining history.
In some traditions, metallic minerals such as stannite have been symbolically associated with strength, grounding, or prosperity, though such interpretations are cultural perspectives rather than scientifically established properties.
Authenticity and Specimen Information
• Mineral Species: Stannite
• Chemical Formula: Cu₂FeSnS₄
• Mineral Group: Sulfides
• Crystal System: Tetragonal
• Colour: Steel-grey to dark brown-black
• Transparency: Opaque
• Lustre: Metallic
• Hardness: Approximately 4 Mohs
• Locality: Cligga Head, Perranporth, Cornwall, United Kingdom
• Authenticity: Genuine natural mineral specimen
• Included: Certificate of Authenticity lifetime guarantee generic card
• Exact Item: The specimen shown in the listing photographs is the crystal you will receive
This Stannite crystal from Cligga Head, Cornwall represents a distinctive example of a tin-bearing sulfide mineral from a historically significant British mining locality, making it a compelling addition to mineral collections focused on rare sulfides, ore minerals, or Cornish geological heritage.
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