Stibiotantalite

A variety of Minerals

Stibiotantalite specimen - rock identification

What is Stibiotantalite?

Stibiotantalite is a mineral consisting of Sb(Ta,Nb)O4 (antimony, tantalum or niobium, and oxygen). It is found in complex granite pegmatites. If the quantity of niobium exceeds the tantalum content, the mineral is called stibiocolumbite. It is translucent to transparent, medium hard (5.5 mohs), appears yellow to dark brown, reddish or greenish brown, with an adamantine luster. Stibiotantalite is found in veins and walls associated with tin mines. It is a fairly rare to rare mineral. Due to its relative softness, it is more likely to be found in mineral collections than in jewelry.

Optical Properties

Refractive Index
2.37-2.45
Birefringence
0.08
Optical Character
Biaxial positive

Stibiotantalite Market Value Calculator

Estimate the market value of Stibiotantalite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Preview only. Full pricing comps and valuation report in the app.

Stibiotantalite Localities Map

See where Stibiotantalite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

Interactive map layers and collecting notes are available in the app.

Quick Facts

Physical Properties

Color
Yellow to dark brown, reddish or greenish brown
Hardness (Mohs)
5.5
Density
7.58 g/cm³
Streak
Light yellow, yellow-brown

Chemical Properties

Chemical Formula
Sb(Ta,Nb)O4
Elements
O, Sb, Ta
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