Rinkite-(Y) is a complex sorosilicate mineral found primarily in alkaline igneous rocks. It typically forms colorless to white prismatic crystals and is prized by collectors of rare earth minerals for its association with exotic pegmatite assemblages.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareRinkite Group family

Rinkite-(Y)

Hardness: ~5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this rinkite-(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 rinkite-(y) with a known reference. Rinkite-(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. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: colorless, white.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: prismatic crystals.

Often confused with

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

mineral

Götzenite

Mohs 5.5-6

How to tell apart: Luster reads vitreous on Rinkite-(Y) and greasy on Götzenite.

How to tell apart: Wöhlerite is the harder of the two (Mohs 6-6.5 vs. ~5); streak differs, so Rinkite-(Y) leaves white, Wöhlerite leaves pale yellow.

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Often found alongside rinkite-(y)

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

All properties

Chemical formula: Na₂Ca₄YTi(Si₂O₇)₂OF₃
Mohs hardness: ~5
Density: 3.44 g/cm³
Colors: Colorless White
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Prismatic crystals
Cleavage: Very good on {100}
Rarity: Rare
Uses: Collector
Host rock: In a pegmatite fragment from an alkaline massif collected from the moraine of the Darai-Pioz glacier

Where rockhounds find rinkite-(y)

Classic worldwide localities

Darai-Pioz alkaline massif, Tien Shan mountains, Tajikistan

Field-hunting tip

Where it forms: In a pegmatite fragment from an alkaline massif collected from the moraine of the Darai-Pioz glacier. If you start seeing quartz, aegirine, microcline in float, you are in the right ground. Typical habit: prismatic crystals. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify rinkite-(y)?+

Mohs hardness is ~5. Luster: vitreous. The streak is white. Common colors include colorless, white.

Where is rinkite-(y) found?+

Notable localities include Darai-Pioz alkaline massif, Tien Shan mountains, Tajikistan.

Is rinkite-(y) safe to handle?+

Contains minor rare earth elements and trace thorium, requiring standard mineral handling precautions such as washing hands after handling and avoiding ingestion or inhalation of dust.

What rocks look like rinkite-(y)?+

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

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

Rinkite-(Y) commonly co-occurs with Quartz, Aegirine, Microcline, Neptunite, Pectolite, Calcite. Spotting any of these in float or country rock is a useful trip signal.

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

Where it forms: In a pegmatite fragment from an alkaline massif collected from the moraine of the Darai-Pioz glacier. Working float back to the host body is the standard way to chase a fresh occurrence.

What is rinkite-(y) used for?+

Rinkite-(Y) is used in collector.

Find rinkite-(y) on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.