Proshchenkoite-(Y) is a rare member of the apatite group characterized by its high yttrium and silicate content. It typically occurs as small, brownish prismatic crystals in highly alkaline igneous environments like the Kola Peninsula.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralrareApatite Group family

Proshchenkoite-(Y)

Hardness: 5
Luster: Vitreous
Streak: White
Transparency: Translucent

Is this proshchenkoite-(y)?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch proshchenkoite-(y) with a known reference. Proshchenkoite-(Y) sits at Mohs 5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Proshchenkoite-(Y) leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Proshchenkoite-(Y) typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: yellowish-brown, brown.
5
Look at form & habit
Crystal system: hexagonal. Typical habit: prismatic crystals.

Often confused with

Proshchenkoite-(Y) vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside proshchenkoite-(y)

Minerals reported to co-occur with proshchenkoite-(y). Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: (Y,REE,Ca,Na)₅(SiO₄,PO₄)₃(F,OH)
Mohs hardness: 5
Density: 4.15 g/cm³
Colors: Yellowish-brown Brown
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Hexagonal
Crystal habit: Prismatic Crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Agpaitic Nepheline Syenites
Typical price: $100-500 for small thumbnail specimens

Where rockhounds find proshchenkoite-(y)

Classic worldwide localities

Kola Peninsula, Russia

Field-hunting tip

Look in agpaitic nepheline syenites country — that is the host setting where proshchenkoite-(y) typically forms. If you start seeing microcline, nepheline, aegirine in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify proshchenkoite-(y)?+

Mohs hardness is 5. It typically shows a vitreous luster. The streak is white. Common colors include yellowish-brown, brown.

Where is proshchenkoite-(y) found?+

Notable localities include Kola Peninsula, Russia.

How much is proshchenkoite-(y) worth?+

Typical asking prices fall in the range of $100-500 for small thumbnail specimens. Quality, size, and provenance can move individual specimens well outside that range.

Is proshchenkoite-(y) safe to handle?+

This mineral is radioactive. Contains minor amounts of radioactive rare earth elements; handle with care and wash hands after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like proshchenkoite-(y)?+

Proshchenkoite-(Y) is most often confused with Apatite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with proshchenkoite-(y)?+

Proshchenkoite-(Y) commonly co-occurs with Microcline, Nepheline, Aegirine, Eudialyte. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does proshchenkoite-(y) form in?+

Proshchenkoite-(Y) typically forms in agpaitic nepheline syenites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is proshchenkoite-(y) used for?+

Proshchenkoite-(Y) is used in collector.

Find proshchenkoite-(y) on the map

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