Rutilated quartz 6 - a photo on Flickriver

Rutilated quartz 6

A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 6000 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.

The oxide minerals all contain one or more oxide anions (O-2). The oxide minerals include species that are hydroxy-oxides. The hydroxide minerals (those with one or more OH-) are usually considered together with the oxides. Many sulfide minerals are not stable in Earth-surface conditions. In the presence of oxygen and moisture, sulfide minerals tend to tarnish or alter to oxides and hydroxy-oxides. All except the most inert elements (such as the platinum-group elements and gold and noble gases) readily form oxides. Gold oxide only forms under special conditions.

Rutile is a titanium oxide mineral (TiO2) and an important titanium ore mineral. Rutile's most common crystal form consists of long, striated needles (acicular crystals). Rutile has an intense submetallic luster, a pale yellow to golden-brown to yellowish-brown to red to almost black color, and is fairly hard (H=6.5). Many twinned crystals have a bent or kinked appearance ("elbow twins").

Rutile occurs in igneous, sedimentary, and metamorphic rocks. It usually occurs as long, slender needles within quartz crystals (= rutilated quartz) and in placer beach sands.

Locality: unknown
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Photo gallery of rutile & rutilated quartz:
www.mindat.org/gallery.php?min=3486
and
www.mindat.org/gallery.php?min=3485

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Taken on: October 18, 2024

Tags:

rutilated

quartz

titanium

oxide

oxides

mineral

minerals « less

Sets appears in: • Minerals - Oxides (Rutile)

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