Description
Natural Ruby Mineral Specimen from Madagascar
This Ruby mineral specimen from Madagascar is a genuine example of natural corundum displaying the rich red colour that makes ruby one of the most recognised gemstone minerals in the world. Carefully selected for its mineral character and colour, this specimen represents a naturally occurring crystal formed through geological processes over millions of years.
The specimen shown in the photographs is the exact crystal you will receive, allowing collectors and buyers to observe the crystal’s natural surface features, colour tone, and structural characteristics before purchase. Please refer to the listing photographs for accurate sizing and scale.
Each mineral specimen includes a Certificate of Authenticity lifetime guarantee generic card, confirming the crystal is a genuine natural mineral.
Mineral Species and Geological Classification
Ruby is the red variety of corundum, an aluminium oxide mineral with the chemical formula Al₂O₃. Corundum belongs to the oxide mineral group and is one of the hardest naturally occurring minerals.
The distinctive red colour of ruby is produced by trace amounts of chromium replacing aluminium atoms within the crystal lattice during formation. The presence of chromium absorbs specific wavelengths of light, resulting in ruby’s characteristic red colour.
Corundum crystals form within the trigonal crystal system, commonly developing as hexagonal prism-shaped crystals or barrel-shaped forms. While gem-quality crystals are often cut for jewellery, natural ruby mineral specimens are valued by collectors for their raw geological form.
Physical Properties of Ruby Corundum
Ruby shares the physical properties of the corundum mineral family, known for its exceptional hardness and durability.
Key mineral properties include:
• Mineral Species: Corundum (Ruby variety)
• Chemical Formula: Al₂O₃
• Mineral Group: Oxides
• Crystal System: Trigonal
• Colour: Deep red to pinkish-red
• Transparency: Transparent to opaque depending on crystal quality
• Lustre: Vitreous to subadamantine
• Mohs Hardness: 9
With a hardness of 9 on the Mohs scale, ruby is one of the hardest natural minerals, second only to diamond in hardness among naturally occurring minerals. This durability contributes to its historical use as a gemstone and industrial mineral.
Geological Formation of Ruby
Ruby crystals form under high-temperature and high-pressure conditions within metamorphic or igneous geological environments. These conditions allow aluminium-rich minerals to crystallise into corundum.
Ruby deposits are commonly associated with:
• Metamorphic marble formations
• High-grade metamorphic rocks
• Basalt-related deposits
• Alluvial gemstone gravels derived from weathered deposits
In metamorphic marble environments, aluminium-rich sediments recrystallise under intense heat and pressure, forming corundum crystals. When chromium is present during this process, ruby crystals develop their red coloration.
Ruby crystals may occur alongside associated minerals such as:
• Spinel
• Calcite
• Garnet
• Feldspar
• Mica
Over geological time, weathering may release ruby crystals from host rock, allowing them to accumulate in secondary alluvial deposits where many gemstone specimens are found.
Ruby Deposits in Madagascar
Madagascar has become an important source of ruby and sapphire corundum deposits in recent decades. The island’s complex geology includes ancient metamorphic terrains that provide favourable conditions for the formation of corundum minerals.
Ruby specimens from Madagascar often display natural crystal faces, varied colour tones, and distinctive mineral associations, reflecting the geological conditions in which they formed.
The island’s gemstone deposits have attracted significant attention from mineral collectors and gem enthusiasts due to the diversity and quality of minerals produced in the region.
Mineral Collecting and Display Appeal
Ruby mineral specimens are prized among collectors due to their geological rarity, vibrant colour, and association with the corundum mineral family.
Natural ruby crystals are especially valued when they retain:
• Natural crystal faces
• Distinct colour zoning
• Visible crystal structures
• Geological host rock or mineral associations
Because each crystal forms under unique geological conditions, every ruby specimen displays its own combination of colour intensity, surface texture, and crystal development.
This specimen is suitable for:
• Mineral collections
• Gemstone mineral displays
• Geological specimen collections
• Educational mineral displays
• Unique natural mineral gifts
Cultural and Historical Context
Ruby has been admired throughout history as one of the most important gemstone minerals. Ancient cultures across Asia, Europe, and the Middle East valued ruby for its vivid colour and durability.
In historical traditions, ruby has been symbolically associated with vitality, strength, and passion, though these interpretations are part of cultural traditions rather than scientifically established properties.
Authenticity and Specimen Information
• Mineral Species: Corundum (Ruby variety)
• Chemical Formula: Al₂O₃
• Mineral Group: Oxide
• Crystal System: Trigonal
• Colour: Red to pinkish-red
• Transparency: Transparent to opaque
• Mohs Hardness: 9
• Formation Environment: Metamorphic marble and alluvial deposits
• Locality: Madagascar
• Authenticity: Genuine natural mineral specimen
• Included: Certificate of Authenticity lifetime guarantee generic card
• Exact Item: The crystal shown in the photographs is the specimen you will receive
This Ruby mineral specimen from Madagascar showcases the striking natural colour and geological formation of one of the world’s most recognised gemstone minerals, making it an impressive addition to mineral collections, gemstone displays, or geological study collections.
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