Description
Realgar Crystal – Natural Arsenic Sulfide Mineral from USA
This striking Realgar crystal specimen from the USA showcases the vivid red to orange-red colour that has made this mineral highly sought after by collectors. Carefully selected for quality, colour saturation, and natural crystal character, this is the exact specimen shown in the photographs. Full sizing details are provided in the listing images to ensure clarity regarding dimensions and scale.
This crystal is a genuine mineral specimen and includes a Certificate of Authenticity along with a lifetime guarantee generic card, confirming its natural origin and mineral identity.
Mineral Classification and Chemical Composition
Realgar is an arsenic sulfide mineral with the chemical formula As₄S₄. It belongs to the sulfide mineral class and crystallises in the monoclinic crystal system. Known for its intense red, scarlet, and orange-red hues, realgar has historically been valued for both its colour and rarity.
The vibrant pigmentation results from its arsenic and sulfur composition, which creates its distinctive fiery appearance. Realgar typically exhibits a resinous to vitreous lustre and may occur in prismatic crystals, granular masses, or crystalline aggregates. Transparency ranges from translucent to opaque depending on crystal thickness and structure.
With a Mohs hardness of approximately 1.5 to 2, realgar is relatively soft and should be handled with care. Its low hardness allows crystal faces and natural formations to remain sharply defined when well preserved.
Geological Formation and Locality Context
Realgar forms in low-temperature hydrothermal veins and volcanic fumarolic environments. It is commonly associated with other arsenic-bearing minerals such as orpiment (As₂S₃), as well as calcite, barite, and stibnite. In hydrothermal systems, mineral-rich fluids circulate through fractures in host rock, depositing sulfide minerals as temperatures and pressures change.
In the United States, realgar specimens are often found in mineralised zones linked to historic mining districts, where hydrothermal alteration introduced arsenic and sulfur into surrounding rock formations. These geological settings can include limestone replacement deposits and epithermal vein systems.
Realgar is known to alter over time when exposed to prolonged light, gradually transforming into a yellow arsenic sulfide mineral known as pararealgar. For this reason, collectors typically display specimens away from direct sunlight to preserve their original colour intensity.
Appearance and Notable Characteristics
This specimen displays the characteristic bold red to deep orange coloration typical of quality realgar. Surface features may include crystalline faces, natural cleavage planes, and subtle internal reflections that enhance its visual depth under light.
The mineral’s strong colour contrast makes it an eye-catching addition to any mineral cabinet or display case. Natural variations in crystal habit, matrix presence, and texture contribute to the individuality of each piece.
No artificial enhancement or colouring has been applied. The specimen remains in its natural state as formed within its geological environment.
Collecting, Display and Traditional Associations
Realgar is prized among mineral collectors for its rarity, colour vibrancy, and distinctive chemical composition. Its intense tones create a dramatic focal point within curated mineral collections. Because of its softness and light sensitivity, it is best displayed in stable indoor lighting conditions.
In various cultural traditions, realgar has been historically associated with symbolic and spiritual practices due to its vivid colour and unusual composition. These associations are cultural in nature and add to the mineral’s historical intrigue.
This genuine USA Realgar crystal offers a unique opportunity to own a naturally formed arsenic sulfide mineral specimen. You will receive the exact crystal shown in the photographs, accompanied by a Certificate of Authenticity and lifetime guarantee generic card, ensuring confidence in its authenticity and quality.
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