5 x Herkimer Diamond Quartz Crystals USA Genuine Double Terminated Specimens with Certificate of Authenticity
£ 14.40
5 X GENUINE HERKIMER DIAMOND CRYSTALS – USA DOUBLE TERMINATED QUARTZThis listing features five genuine Herkimer Diamond crystals from the United
States, carefully selected for clarity, natural form and crystal definition. The photograph shows the exact specimens you will receive. Please refer to the images for full sizing details and scale.Each set includes a Certificate of Authenticity lifetime guarantee generic card confirming that these crystals are genuine natural quartz specimens from the Herkimer County region, New York, USA. MINERAL & GEOLOGICAL DETAILS – HERKIMER DIAMOND (QUARTZ VARIETY)Herkimer Diamonds are not true diamonds but exceptionally clear, naturally double-terminated quartz crystals. They are a variety of Quartz composed of silicon dioxide (SiO₂) and crystallise in the trigonal crystal system.What makes Herkimer Diamonds distinctive is their natural double termination, meaning both ends of the crystal are fully formed points. This occurs because the crystals grew freely within cavities rather than being attached to a rock matrix on one side.Mineral Type: QuartzChemical Formula: SiO₂Crystal System: TrigonalHardness: 7 on the Mohs scaleLustre: Vitreous (glass-like)Transparency: Transparent to translucentThese crystals formed approximately 500 million years ago during the Cambrian period within dolostone formations in Herkimer County, New York. The quartz developed inside vugs and cavities in the host rock, where silica-rich fluids slowly crystallised under stable geological conditions.Associated minerals in the region may include dolomite, calcite and small hydrocarbon inclusions. Some Herkimer Diamonds contain internal inclusions such as water bubbles, carbon particles or tiny mineral fragments, adding geological interest and uniqueness to each piece. DOUBLE TERMINATED CRYSTAL FORMATIONThe natural double-terminated habit is the hallmark of Herkimer Diamonds. Crystals typically display:
• Six-sided prismatic bodies
• Sharp, symmetrical termination points at both ends
• Fine growth striations on crystal faces
• Occasional internal inclusions or “phantoms”Their exceptional clarity and geometric symmetry give them a brilliant, diamond-like appearance, which inspired the name “Herkimer Diamond.”Because these crystals grew freely in open cavities, they developed well-formed terminations without attachment scars, making them particularly desirable among mineral collectors. GEOLOGICAL SIGNIFICANCE & USA LOCALITYHerkimer Diamonds are exclusively sourced from Herkimer County, New York, making locality an important factor in authenticity and collectibility. The crystals formed in Cambrian-age dolostone deposited in shallow marine environments, later altered and fractured to create cavities where quartz crystallised.The region is internationally recognised for producing some of the finest double-terminated quartz crystals in the world. Their consistent clarity and distinctive growth habit distinguish them from standard quartz points found elsewhere. COLLECTIBLE MINERAL SPECIMENS & DISPLAY SETThis set of five Herkimer Diamond crystals offers a versatile addition to any mineral collection. Their transparent appearance and natural geometric form make them suitable for display, educational collections or jewellery design projects.Each crystal displays natural variation in size, clarity and internal features, reflecting authentic geological formation. The specimens shown in the photograph are the exact pieces you will receive. AUTHENTICITY & PRESENTATIONThese Herkimer Diamond quartz crystals have been carefully chosen for quality and crystal definition. Included is a Certificate of Authenticity lifetime guarantee generic card confirming the specimens are genuine quartz crystals from Herkimer County, USA.Combining documented American locality, exceptional natural clarity and classic double-terminated formation, this set of five Herkimer Diamond crystals offers geological authenticity and timeless mineral appeal in one carefully selected collection.
States, carefully selected for clarity, natural form and crystal definition. The photograph shows the exact specimens you will receive. Please refer to the images for full sizing details and scale.Each set includes a Certificate of Authenticity lifetime guarantee generic card confirming that these crystals are genuine natural quartz specimens from the Herkimer County region, New York, USA. MINERAL & GEOLOGICAL DETAILS – HERKIMER DIAMOND (QUARTZ VARIETY)Herkimer Diamonds are not true diamonds but exceptionally clear, naturally double-terminated quartz crystals. They are a variety of Quartz composed of silicon dioxide (SiO₂) and crystallise in the trigonal crystal system.What makes Herkimer Diamonds distinctive is their natural double termination, meaning both ends of the crystal are fully formed points. This occurs because the crystals grew freely within cavities rather than being attached to a rock matrix on one side.Mineral Type: QuartzChemical Formula: SiO₂Crystal System: TrigonalHardness: 7 on the Mohs scaleLustre: Vitreous (glass-like)Transparency: Transparent to translucentThese crystals formed approximately 500 million years ago during the Cambrian period within dolostone formations in Herkimer County, New York. The quartz developed inside vugs and cavities in the host rock, where silica-rich fluids slowly crystallised under stable geological conditions.Associated minerals in the region may include dolomite, calcite and small hydrocarbon inclusions. Some Herkimer Diamonds contain internal inclusions such as water bubbles, carbon particles or tiny mineral fragments, adding geological interest and uniqueness to each piece. DOUBLE TERMINATED CRYSTAL FORMATIONThe natural double-terminated habit is the hallmark of Herkimer Diamonds. Crystals typically display:
• Six-sided prismatic bodies
• Sharp, symmetrical termination points at both ends
• Fine growth striations on crystal faces
• Occasional internal inclusions or “phantoms”Their exceptional clarity and geometric symmetry give them a brilliant, diamond-like appearance, which inspired the name “Herkimer Diamond.”Because these crystals grew freely in open cavities, they developed well-formed terminations without attachment scars, making them particularly desirable among mineral collectors. GEOLOGICAL SIGNIFICANCE & USA LOCALITYHerkimer Diamonds are exclusively sourced from Herkimer County, New York, making locality an important factor in authenticity and collectibility. The crystals formed in Cambrian-age dolostone deposited in shallow marine environments, later altered and fractured to create cavities where quartz crystallised.The region is internationally recognised for producing some of the finest double-terminated quartz crystals in the world. Their consistent clarity and distinctive growth habit distinguish them from standard quartz points found elsewhere. COLLECTIBLE MINERAL SPECIMENS & DISPLAY SETThis set of five Herkimer Diamond crystals offers a versatile addition to any mineral collection. Their transparent appearance and natural geometric form make them suitable for display, educational collections or jewellery design projects.Each crystal displays natural variation in size, clarity and internal features, reflecting authentic geological formation. The specimens shown in the photograph are the exact pieces you will receive. AUTHENTICITY & PRESENTATIONThese Herkimer Diamond quartz crystals have been carefully chosen for quality and crystal definition. Included is a Certificate of Authenticity lifetime guarantee generic card confirming the specimens are genuine quartz crystals from Herkimer County, USA.Combining documented American locality, exceptional natural clarity and classic double-terminated formation, this set of five Herkimer Diamond crystals offers geological authenticity and timeless mineral appeal in one carefully selected collection.
