Chiappinoite-(Y) is a rare yttrium-rich silicate mineral found as tiny, colorless to white platy crystals in granite pegmatites. It is primarily a collector's species identified through sophisticated analytical methods such as electron microprobe or X-ray diffraction, as it is visually indistinct from other rare earth element minerals.
Is this chiappinoite-(y)?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch chiappinoite-(y) with a known reference. Chiappinoite-(Y) sits at Mohs ~6, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 4Match the color rangeCompare against the expected color range: colorless.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: platy crystals.
Often confused with
Chiappinoite-(Y) vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside chiappinoite-(y)
Minerals reported to co-occur with chiappinoite-(y). Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Y₂Mn(Si₃O₇)₄
- Mohs hardness
- ~6
- Density
- 3.09 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Orthorhombic
- Crystal habit
- Platy crystals
- Cleavage
- Perfect on {001}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- In vugs in a block of peralkaline syenitic volcanic ejectum
Where rockhounds find chiappinoite-(y)
Classic worldwide localities
- Chiappino, Baveno, Italy
Field-hunting tip
Where it forms: In vugs in a block of peralkaline syenitic volcanic ejectum. If you start seeing astrophyllite, dalyite, elpidite in float, you are in the right ground. Typical habit: platy crystals. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify chiappinoite-(y)?+
Where is chiappinoite-(y) found?+
What rocks look like chiappinoite-(y)?+
What minerals are found with chiappinoite-(y)?+
What kind of rock does chiappinoite-(y) form in?+
What is chiappinoite-(y) used for?+
Find chiappinoite-(y) on the map
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