Angrites – Rare Achondrite Meteorites

One of the Rarest Meteorite Groups

Angrites are an exceptionally rare class of achondrite meteorites, with only a limited number of known specimens worldwide. Their scarcity alone makes them highly significant in both scientific and collecting contexts.

They are named after the Angra dos Reis meteorite, discovered in Brazil in 1869, which became the type specimen for this group.

Extremely Ancient Rocks

Angrites are among the oldest igneous rocks known in the Solar System, with formation ages dating back more than 4.5 billion years.

They formed very early in Solar System history, during the first stages of planetary differentiation, when small bodies began to melt and separate into core, mantle, and crust.

Unique Mineralogy

Angrites are characterized by an unusual mineral assemblage, including:

• Calcium-rich olivine
• Anorthite
• Clinopyroxene

Their chemical composition is distinct from other achondrites, reflecting highly specific formation conditions.

This unique mineralogy provides valuable constraints on the processes occurring in early planetary bodies.

Formation and Parent Body

Angrites are believed to originate from a differentiated parent body that underwent early melting and rapid cooling.

The exact identity of this parent body remains uncertain, adding to the scientific interest of these meteorites.

Their formation conditions suggest a highly oxidized environment compared to many other achondrites.

Scientific Importance

Angrites are crucial for understanding:

• The timing of planetary differentiation
• Early melting processes in small bodies
• The chemical evolution of the Solar System

They are frequently used in high-precision isotopic studies to constrain the earliest events in Solar System history.

Collector Interest

Due to their rarity and scientific importance, angrites are highly sought after by advanced collectors. Their limited availability makes them particularly desirable.

Specimens are often small and rare, further increasing their value within the meteorite market.

Available Specimens

The specimens presented in this category include selected angrites, offering access to this rare and scientifically important group of meteorites.

FAQ

What are angrites?

Angrites are rare achondrite meteorites formed during the earliest stages of planetary differentiation.

Why are angrites important?

They provide insights into the formation and evolution of early planetary bodies.

Are angrites rare?

Yes, they are among the rarest meteorite groups.

How old are angrites?

They are over 4.5 billion years old, making them among the oldest igneous rocks in the Solar System.

Where do angrites come from?

They originate from a differentiated parent body, though its exact identity remains unknown.