Large Amethyst Geode with Calcite — 5kg Cathedral Specimen, Brazil

A truly extraordinary natural amethyst geode, hand-selected for its exceptional depth of colour, rich calcite inclusions, and commanding cathedral formation. At over 5kg and nearly 30cm tall, this is a statement piece in every sense — equally at home in a serious mineral collection, a luxury interior, or a meditation space.

Specimen Details

• Dimensions: 29 × 19.5 × 11 cm (approx. 11.4 × 7.7 × 4.3 in)
• Weight: 5.068 kg (approx. 11.2 lb)
• Formation type: Cathedral geode with calcite inclusions
• Origin: Ethically sourced from Brazil
• Colour: Deep violet-purple amethyst with white/cream calcite
• Treatment: Natural and untreated
• Exact piece guarantee: You receive the piece shown — no substitutions

Geology of Amethyst

Amethyst is the purple variety of quartz (SiO₂), coloured by trace amounts of iron and natural irradiation within the crystal lattice. It forms inside volcanic rock cavities — known as geodes — where silica-rich hydrothermal fluids slowly crystallise over millions of years. The result is the iconic hollow cavity lined with inward-pointing crystals that defines a geode.

Cathedral amethyst refers to geodes with tall, spire-like crystal formations that resemble the vaulted architecture of a cathedral — one of the most prized geode forms among collectors. The presence of calcite in this specimen adds a secondary mineral layer, formed when calcium carbonate-rich fluids later permeated the cavity, creating the white to cream crystalline deposits visible alongside the amethyst.

• Mineral: Amethyst (variety of quartz, SiO₂)
• Crystal system: Trigonal (hexagonal)
• Hardness: 7 on the Mohs scale
• Specific gravity: 2.65
• Lustre: Vitreous
• Transparency: Transparent to translucent
• Colour cause: Iron impurities + natural gamma irradiation
• Secondary mineral: Calcite (CaCO₃) — trigonal, Mohs 3
• Formation environment: Hydrothermal veins and volcanic basalt cavities
• Notable localities: Rio Grande do Sul (Brazil), Uruguay, Zambia, South Korea, Mexico

History & Cultural Significance

Amethyst has been prized by civilisations for over 4,000 years. Ancient Egyptians carved it into amulets and scarabs; Greek and Roman nobility wore amethyst rings and goblets, believing the stone prevented intoxication — the name derives from the Greek amethystos, meaning “not drunk.” Medieval European clergy wore amethyst as a symbol of piety and celibacy, and it featured prominently in royal regalia across Britain, Russia, and the Holy Roman Empire.

Brazil — particularly the Rio Grande do Sul region — became the world’s dominant source of amethyst geodes in the 20th century, supplying museum collections and private collectors globally with specimens of unmatched size and colour saturation.

Crystal Properties of Amethyst

Amethyst is one of the most widely used crystals in healing and spiritual traditions. It resonates with the crown chakra and third eye chakra, and is associated with clarity of mind, protection, and spiritual connection.

Energetic & Emotional Properties

• Calm & clarity: Quiets mental chatter and promotes clear, focused thinking
• Protection: Long regarded as a protective stone against negative energy and psychic stress
• Sleep support: One of the most recommended crystals for insomnia — place near the bed to encourage restful sleep
• Spiritual awareness: Enhances intuition, meditation depth, and connection to higher consciousness
• Sobriety & balance: Historically associated with temperance and emotional equilibrium

Stone Reference Data

• Chakras: Crown (7th) and Third Eye (6th)
• Zodiac: Pisces, Virgo, Aquarius, Capricorn
• Element: Air, Water
• Birthstone: February
• Hardness: 7 (Mohs)

How to Use This Geode

• Display in a living room, bedroom, or hallway as a natural focal point
• Place in a meditation or yoga space to deepen practice and calm the mind
• Position in a home office to promote focus and reduce stress
• Use as a charging station — many practitioners place smaller crystals inside the geode cavity to cleanse and energise them
• Gift for birthdays (especially February), housewarmings, or milestone occasions

Perfect For

• Mineral collectors seeking a high-quality Brazilian cathedral geode
• Luxury interior design — living rooms, studies, reception areas
• Meditation rooms, yoga studios, and wellness spaces
• Thoughtful gifts for crystal lovers, spiritual practitioners, or design-conscious friends
• February birthstone gifts

Care & Handling

• Avoid prolonged direct sunlight — UV exposure can fade amethyst’s purple colour over time
• Dust gently with a soft dry brush or cloth — avoid harsh chemicals
• The calcite inclusions are softer (Mohs 3) than the amethyst — handle with care to avoid chipping
• Store on a stable, flat surface — geodes are top-heavy and can tip

Natural Specimen Notice

As a natural mineral specimen, minor surface variations, inclusions, or blemishes are inherent to the piece and not considered defects. Please review all photos carefully and verify measurements before purchasing.

Need additional photos or have a question? Contact us — we’re happy to help.

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