Amblygonite
The Lithium Light Stone
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Quick Facts
Formation & Origin
Amblygonite is a lithium-aluminum phosphate mineral (LiAlPO₄F), valued as a minor lithium ore and occasionally cut as a soft collector gem. Amblygonite forms in lithium-rich granitic pegmatites alongside spodumene (kunzite/hiddenite), lepidolite, and tourmaline. It crystallizes from phosphorus- and fluorine-bearing fluids in the late stages of pegmatite formation when lithium concentrations are highest.
The name comes from the Greek 'amblys' (blunt) and 'gonia' (angle), referring to the obtuse angle of its cleavage planes. Despite containing lithium (the element used in mood stabilizers and batteries), the lithium in amblygonite isn't bioavailable through handling.
Gem-quality amblygonite is quite rare. Most crystals are pale and not particularly eye-catching, which is why it remains obscure despite being relatively common in pegmatites. Fine transparent yellow or green specimens from Brazil can be faceted into attractive if somewhat soft gems.
Identification Guide
Amblygonite is identified by its pale colors, vitreous to greasy luster, and association with lithium pegmatite minerals. Hardness of 6, good cleavage in two directions, and specific gravity around 3.0 help narrow it down.
Distinguish from feldspar (similar appearance but different cleavage angles), brazilianite (similar color but different crystal system), and quartz (harder, no cleavage). A flame test showing persistent red (lithium) is diagnostic but destructive.
Spotting Fakes
Amblygonite is too obscure and affordable to be commonly faked. The main confusion is misidentification as other pale pegmatite minerals like feldspar or scapolite. Gem-quality faceted amblygonite exists but is primarily a collector curiosity. If purchasing, verify with RI (1.611-1.637) and SG testing.
Some links in this post go to Amazon. Crystal Almanac earns a commission from qualifying purchases at no extra cost to you. Tools recommended here are ones we would use ourselves to run the tests described - the recommendation comes first, the link is downstream of it.
Cultural & Metaphysical Traditions
Presented as cultural traditions, not scientific evidence
Amblygonite is associated with creativity, focus, and calm confidence in crystal healing. Its lithium content connects it to emotional balance, though practitioners note the lithium isn't absorbed through skin. Some traditions use it for overcoming creative blocks and finding the persistence to complete projects.
Metaphysical and “healing” associations are cultural traditions, not medical advice or scientific fact. Crystals are not a substitute for professional medical care.
Where It's Found
Large gem-quality crystals, primary source
Fine faceting material
Pegmatite specimens
Type locality, first described 1817
Price Guide
Good to Know
Scratch test: At hardness 6, Amblygonite resists scratching from a knife but can be scratched by quartz. Best for pendants and earrings rather than rings.
Global supply: Found in 4 notable locations worldwide, from Brazil to France.
Heft test: Amblygonite has average mineral density (3.01-3.11). It feels about as heavy as you'd expect from a stone its size.
Care & Safety
What amblygonite can and cannot tolerate, based on its hardness (Mohs 6) and chemistry (LiAlPO₄F).
Can Amblygonite go in water?
Yes. Amblygonite is not water-soluble and durable enough (Mohs 6), so plain water is fine for rinsing and cleaning with mild soap. Avoid prolonged soaking, which serves no purpose, and dry the stone afterward.
Can Amblygonite go in salt water?
Not recommended, even though amblygonite itself is hard and not water-soluble. Salt is corrosive and mildly abrasive: it can dull a polished surface, attack metal settings, and crystallize inside small fractures as the stone dries. A brief dip will not destroy amblygonite, but rinse it with fresh water afterward and dry it. For routine cleaning, plain water is the safer choice.
Sources & References
The mineralogical and gemological data on this page is drawn from and can be cross-checked against these external references.
- WikipediaAmblygonite on Wikipedia
- WebmineralAmblygonite mineral data (Webmineral)
- Handbook of MineralogyAmblygonite (Handbook of Mineralogy, PDF)
Related Minerals
Fellow lithium mineral from pegmatites
Another rare phosphate from similar environments
Hydroxyl-dominant end member of the series
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