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Phlogopite
Phlogopite is phyllosilicate (mica), KMg₃(AlSi₃O₁₀)(F,OH)₂. In the hand, it rates 2 to 3 on the Mohs scale, and it runs bronze brown and amber. The bronze-amber mica, peels into flexible coppery sheets, paler and warmer-toned than biotite, at home in marbles and ultramafic rocks.
The geology.
Phlogopite carries the formula KMg₃(AlSi₃O₁₀)(F,OH)₂. It belongs to the monoclinic system. Catalogues list it as phyllosilicate (mica).
It sits at 2 to 3 on the Mohs scale. The surface reads pearly to submetallic bronze. Light behaviour is translucent in sheets. Specific gravity runs 2.76 to 2.90. The streak is white. It breaks with perfect basal cleavage, flexible sheets.
The bronze-amber mica, peels into flexible coppery sheets, paler and warmer-toned than biotite, at home in marbles and ultramafic rocks.
It reaches buyers as mica books in marble, tapered barrel crystals or flexible sheets.
The origins.
Metamorphosed magnesium rocks: Ontario and Quebec (Canada, giant books), Madagascar, Finland, New York (USA).
On value, the database notes: common; star-sheet specimens are charming inexpensive finds.
Traditional associations.
In energy work traditions, phlogopite has little established lore; modern writers link micas with reflection and flexibility.
We keep this section because people ask. It sits below the geology on purpose, and none of it describes something the stone does.
Spotting the real thing.
The bronze-amber mica, peels into flexible coppery sheets, paler and warmer-toned than biotite, at home in marbles and ultramafic rocks.
| Looks like | How to tell them apart |
|---|---|
| Biotite | Biotite is darker black-brown; phlogopite glows amber-bronze in thin flakes |
| Muscovite | Muscovite is silvery-clear; phlogopite is distinctly warm bronze |
| Goldstone | Man-made glitter glass, not peelable sheets |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on phlogopite.
| Test | What you should see |
|---|---|
| By eye | Peels into flexible elastic sheets |
| Scratch check | Fingernail scratches it |
| By eye | Some sheets show 6-ray star asterism against a point light |
If these checks leave you unsure, that is what appraisers are for. Do not file, heat or soak a piece to find out.
Care & handling.
At 2 to 3 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with perfect basal cleavage, flexible sheets, which is worth knowing before you set it or drop it.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is KMg₃(AlSi₃O₁₀)(F,OH)₂. Crystal system: Monoclinic. Specific gravity: 2.76 to 2.90. Streak: White. Cleavage and fracture: Perfect basal cleavage, flexible sheets.
How it reaches the market
Metamorphosed magnesium rocks: Ontario and Quebec (Canada, giant books), Madagascar, Finland, New York (USA).
What it gets confused with
Biotite: Biotite is darker black-brown; phlogopite glows amber-bronze in thin flakes. Muscovite: Muscovite is silvery-clear; phlogopite is distinctly warm bronze. Goldstone: Man-made glitter glass, not peelable sheets.
What it is worth
Common; star-sheet specimens are charming inexpensive finds.
One more thing
Canadian phlogopite books once grew to two meters, miners quarried single crystals like timber for electrical insulation.
An education-first guide.
There is nothing to buy on this page. Phlogopite is not part of our catalogue, and the guide is here anyway because somebody searching the name deserves a straight answer.
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