Acasta Gneiss 4 Billion Year Old Rock Oldest Known Earth Stone Canada

Acasta Gneiss – 3.6–4 Billion Year Old Rock from Northwest Territories, Canada

This exceptional Acasta Gneiss specimen originates from the Northwest Territories, Canada, and represents some of the oldest known rock material on Earth, dated to approximately 3.6 to 4 billion years old. Formed during the Hadean to early Archean Eon, this remarkable metamorphic rock preserves evidence from the earliest chapters of our planet’s geological history.

The photographs show the actual specimen you will receive, allowing you to examine the banding, mineral composition, texture, and natural structure. Please refer to the images for full sizing and proportions.

This is a genuine geological specimen and includes a Certificate of Authenticity lifetime guarantee generic card, confirming its authenticity and provenance.

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Geological Age & Significance

Acasta Gneiss is part of the ancient Acasta Gneiss Complex, located near Great Slave Lake in Canada. Radiometric dating, particularly uranium-lead dating of zircon crystals, has confirmed ages of up to approximately 4.0 billion years, making it among the oldest known intact crustal rocks on Earth.

These rocks formed during a time when Earth’s crust was still stabilising following planetary formation. Their survival provides invaluable evidence for understanding early continental crust development, magma differentiation, and the planet’s formative conditions.

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Rock Type & Mineral Composition

Acasta Gneiss is classified as a high-grade metamorphic rock, derived from earlier igneous protoliths such as tonalite and granodiorite.

Typical mineral components include:

• Quartz (SiO₂)

• Feldspar (Plagioclase and K-feldspar)

• Biotite mica

• Hornblende

• Accessory zircon crystals

Scientific classification:

• Rock Type: Metamorphic

• Texture: Gneissic banding

• Dominant Minerals: Quartz and feldspar

• Crystal System (Quartz): Trigonal

• Crystal System (Feldspar): Triclinic or Monoclinic depending on type

The distinctive gneissic banding results from intense metamorphism under high temperature and pressure, causing mineral segregation into light and dark layers.

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Structure & Visual Characteristics

In this specimen, you may observe:

• Alternating light and dark mineral bands

• Coarse crystalline texture

• Quartz-rich lighter zones

• Darker biotite or hornblende-rich bands

• Subtle foliation caused by deep crustal deformation

Zircon crystals, though typically microscopic, are crucial for age determination. These resilient minerals preserve isotopic signatures that enable precise dating of the rock’s formation.

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Formation Environment

Acasta Gneiss originally formed from early continental crust material that crystallised from magma. It later underwent intense metamorphism during tectonic processes deep within the Earth’s crust.

The high pressures and temperatures reorganised the mineral grains into the characteristic banded structure seen today. The rock has since been uplifted and exposed through billions of years of erosion.

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Collecting, Educational & Historical Value

A specimen of Acasta Gneiss represents:

• One of the oldest known pieces of Earth’s crust

• A tangible connection to the Hadean–Archean transition

• A significant geological and educational artefact

• A unique addition to mineral and fossil collections

• A rare and meaningful gift for geology enthusiasts

In various traditions, ancient stones are symbolically associated with deep time and Earth history; such interpretations are cultural rather than scientific. Scientifically, Acasta Gneiss is valued for its extraordinary age and importance in understanding early planetary development.

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Authenticity & What You Will Receive

• Genuine Acasta Gneiss from Northwest Territories, Canada

• Approximately 3.6–4 billion years old

• The exact specimen shown in the photographs

• Carefully selected historic geological piece

• Includes Certificate of Authenticity lifetime guarantee generic card

A rare opportunity to own a fragment of Earth’s earliest preserved crust, offering a direct physical connection to our planet’s ancient beginnings.