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Fossil Algae Citrine Agate 13.2 lbs Washington County Missouri

13.155 citrine agate 14x12x4 fossil algae washingting lace agate 900mil missourii

Fossil Algae Citrine Agate 13.2 lbs — Washington County, Missouri

Name: Fossil Algae Citrine Agate 13.2 lbs — Washington County, Missouri
Brand: Crystals.com
SKU: AVANT-FCA-13155
Price: 898.00 USD
Availability: InStock

$898.00 USD

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Why this piece is different

900 million years old. Fossilized algae colonies are preserved inside this citrine agate — ancient single-celled organisms trapped in silica as the agate formed around them. The citrine druzy grew later, filling the remaining cavity with golden crystal. You're looking at two geological events separated by hundreds of millions of years in a single specimen.

ABOUT ▾

Abundance · Ancient Earth · One of a Kind

A museum-quality citrine agate from Washington County, Missouri — the same historic mineral district as its companion piece in this collection. At 13.2 pounds and roughly 14x12x4 inches, this is a serious display specimen.

What makes this piece extraordinary is the fossilized algae visible throughout the agate matrix. These are stromatolite-like structures — colonies of ancient cyanobacteria that lived roughly 900 million years ago during the Proterozoic Eon, long before complex life existed on Earth. The silica-rich fluids that formed the agate preserved these organisms in place, and later, citrine crystals grew in the remaining open space.

The result is a specimen that tells two stories at once: the ancient biological world preserved in stone, and the mineral world that crystallized around it. This is Washington County lace agate at its finest.

FORMATION ▾

Washington County, Missouri sits within the St. Francois Mountains — some of the oldest exposed rock in North America, formed during Precambrian volcanic activity over a billion years ago. Cavities in this volcanic rock became the hosts for agate formation as silica-laden groundwater slowly deposited layer after layer of chalcedony and microcrystalline quartz.

In this specimen, the agate captured fossilized algae — ancient photosynthetic organisms that had colonized shallow waters around these volcanic formations. As the agate encased them, their structures were mineralized and preserved. The golden citrine druzy lining the interior cavity formed later, when iron-bearing silica solutions crystallized as macrocrystalline quartz in the remaining open space.

The agatized exterior shows the classic banding that Washington County material is known for — sometimes called "lace agate" for its intricate patterns.

DETAILS ▾

• Mineral: Citrine (quartz variety, SiO₂) with fossilized algae in agate matrix
• Weight: 13.2 lbs (6 kg)
• Dimensions: Approximately 14 x 12 x 4 inches
• Origin: Washington County, Missouri, United States
• Age: Agate host rock: Precambrian (~1 billion years); fossil algae: ~900 million years
• Features: Fossilized algae inclusions, citrine druzy interior, agatized banded exterior (Washington County lace agate)
• Mohs hardness: 7 (quartz/citrine) / 6.5–7 (agate)
• One of a kind — you receive this exact specimen

HOW TO DISPLAY ▾

At over 13 pounds, this needs a solid surface — a console table, deep shelf, or cabinet top. Position it where natural light can reach the citrine crystals; the golden druzy comes alive in sunlight and warm indoor light.

This is a conversation piece. The fossil inclusions are visible to the naked eye and reward closer inspection. Consider pairing it with its companion specimen — the 8 lb Citrine Agate Cluster from the same Missouri locality — for a collected, museum-style display. Both pieces share the same geological origin and visual warmth.

LEARN MORE ▾

• Shop All Citrine
• Shop All Agate
• Collector's Edition
• Companion Piece: Citrine Agate Cluster 8 lbs
• Natural Citrine vs Heat-Treated Guide

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Orders usually ship in 1-2 business days. We ship orders Monday - Thursday. We make fast shipping a priority!
Yes, 100%!
We are dedicated to Sourcing the highest quality crystals from around the world, working closely with various mines to ensure transparency of the process, quality and sustainability.

We prioritize quality in the shop, none of our crystals have been heat treated or dyed, and we maintain high levels for our ritual products only carrying non-toxic items. You can feel at ease knowing that you're working with authentic crystals that come from trusted sources.
US orders over $150 have free shipping. Orders under that value will be $7.99 to ship
Express shipping available.

Each crystal will typically have the country of origin in the product description. If you have any questions, reach out here!
Explore our CRYSTALS 101 guide HERE to learn more about crystal meanings and uses. or home decor tips for your crystals