Hutcheonite
Ca3Ti2(SiAl2)O12
A titanium-aluminum garnet discovered in calcium-aluminum inclusions of the Allende meteorite, recording the earliest history of the solar system.
- Mohs hardness
- ~7
- Color
- colorless to pale (microscopic)
- Type
- mineral
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Overview
Hutcheonite is a rare titanium-aluminum garnet of the garnet group, with calcium, titanium, silicon, and aluminum in its structure. It was discovered as microscopic grains in the Allende meteorite, within calcium-aluminum-rich inclusions (CAIs), some of the oldest solid materials known.
Because it occurs only as tiny crystals, hutcheonite is studied with electron microscopy rather than seen by eye. It is isometric like other garnets and chemically related to schorlomite and the titanium garnet series.
The mineral is named after cosmochemist Ian Hutcheon, recognizing its significance to meteorite and early-solar-system research.
Formation & geology
Hutcheonite formed in the early solar system as a secondary mineral within calcium-aluminum-rich inclusions in carbonaceous chondrite meteorites. CAIs condensed from the hot solar nebula, and hutcheonite developed during later alteration of primary CAI minerals such as perovskite and other titanium-bearing phases.
Its presence records the high-temperature chemistry and subsequent alteration of the solar nebula more than 4.5 billion years ago.
The type occurrence is the Allende meteorite, a famous CV3 carbonaceous chondrite that fell in Mexico in 1969 and is a key sample for cosmochemistry.
How to identify it
Hutcheonite cannot be identified in the field or by eye; it exists only as microscopic grains inside meteoritic calcium-aluminum inclusions. Identification relies on electron microprobe and electron-backscatter techniques showing its garnet structure and Ca-Ti-Si-Al chemistry.
It is distinguished from associated CAI minerals such as perovskite, grossite, and hibonite by its garnet composition and crystallography. There are no terrestrial look-alikes encountered in ordinary rockhounding.
Uses & significance
Hutcheonite has no commercial use; it is purely a research mineral. Its importance is cosmochemical: as a secondary phase in CAIs, it helps scientists reconstruct the temperatures, chemistry, and alteration history of the earliest solar system.
It is of interest to meteorite researchers and museums rather than collectors or jewelers, and it has no metaphysical tradition.
Frequently asked questions
Where was hutcheonite found?
As microscopic grains in calcium-aluminum-rich inclusions of the Allende meteorite, a carbonaceous chondrite.
Why is hutcheonite scientifically important?
It records the chemistry and alteration of the early solar system within some of the oldest solids known.
Can you see or buy hutcheonite?
No. It occurs only as microscopic crystals in meteorites and is a research mineral, not a collectible gem.
Is hutcheonite a garnet?
Yes. It is a titanium-aluminum member of the garnet group, related to schorlomite.
Hutcheonite guides
In-depth guides for identifying, valuing, and understanding Hutcheonite.
