Brown Stones: List, Shades, Symbolism, Imitations and Care

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Smoky quartz, tiger's eye, amber, petrified wood, brown jasper, staurolite... : brown stones, their shades, hardness, symbolism and the pitfalls to avoid.

Key points

Shades	Beige, sand, honey, caramel, coffee, chocolate, rust, mahogany, bronze
Best-known stones	Smoky quartz, tiger's eye, amber, petrified wood, brown jasper
Hardest	Staurolite (7 to 7.5), smoky quartz (7), tiger's eye and jaspers (6.5 to 7)
Softest	Amber (2 to 2.5), desert rose (2 to 3.5), septarian
Not to be confused with	Natural tiger's eye and heated tiger's eye (bull's eye); amber, copal and plastic
Symbolism	Earth, wood, stability, simplicity; a modern convention that varies by culture

Brown, a colour of earth, iron and organic matter

Brown is not a pure colour: it is a darkened yellow, orange or red. In stones, it most often comes from iron oxides (goethite, fine rust in jaspers), from the natural irradiation of a quartz (smoky quartz), from fibres replaced by silica (tiger's eye) or from fossilised organic matter (amber, petrified wood). One and the same shade can therefore cover a mineral, a rock, a resin and a wood that has turned to stone. Neighbouring shades are found among orange stones, yellow stones, red stones and black stones.

The main brown stones

Stone	Shade	Hardness	Good to know
Smoky quartz	smoky grey to brown, sometimes almost black	7	quartz; very dark and uniform, often irradiated
Tiger's eye	golden brown, silky sheen	6.5 to 7	fibrous quartz; heating and dyeing possible
Pietersite	golden brown, blue-grey, rust	about 6.5 to 7	breccia of chatoyant quartz; Namibia, China
Amber	honey yellow to brown	2 to 2.5	fossil resin, not a mineral; copal, plastics
Petrified wood	brown, red, grey	about 6.5 to 7	wood replaced by silica
Cappuccino jasper	coffee and cream brown	6.5 to 7, or 3 to 4 if limestone	appearance varies from one seller to another
Landscape jasper	beige, brown, rust	6.5 to 7	microcrystalline quartz with horizon-like patterns
Leopard jasper	cream to orange, brown spots	about 6.5 to 7	Mexican rhyolite rather than jasper
Dalmatian jasper	cream, dark brown spots	about 6 to 7	a rock, not a jasper in the strict sense
Mookaite	cream, rust, yellow	about 6.5 to 7	jasper from Western Australia
Mahogany obsidian	black marbled with red-brown	5 to 5.5	volcanic glass; sharp fragments
Sardonyx	red-brown and white bands	6.5 to 7	banded chalcedony; dyeing possible
Bronzite	bronze brown, metallic sheen	about 5.5 to 6	magnesium and iron pyroxene
Staurolite	brown	7 to 7.5	twinned crystals shaped like a cross
Chiastolite	grey-brown, dark cross	about 6.5 to 7.5	andalusite with carbon inclusions
Septarian	yellow-brown, calcite veins	soft (calcite, clay)	fissured nodule; damaged by acids and water
Goethite	yellow-brown to black-brown	5 to 5.5	iron oxyhydroxide, the basis of rust
Desert rose	beige to sandy brown	2 to 3.5	gypsum or barite; fears water

A few details

The smoky quartz owes its tint to natural irradiation acting on traces of aluminium in the crystal; when it is almost black, it is called morion, and its Scottish name is cairngorm. Tiger's eye is a quartz that has replaced the fibres of an asbestiform mineral, crocidolite, hence its silky, shifting sheen; when heated, it turns red-brown and becomes bull's eye. Amber is fossil tree resin, very light and warm to the touch. Petrified wood is wood whose material has been replaced by silica: the growth rings can still be read. Staurolite (the cross stone) and chiastolite naturally show a cross, the first through the intergrowth of two crystals, the second through carbon inclusions. Pietersite, described in Namibia in 1962, is a breccia of tiger's eye with swirling reflections. Finally, “cappuccino jasper”, “landscape jasper” or “leopard jasper” are trade names that group together varied materials.

What brown evokes, across cultures

Brown is the colour of earth, wood and autumn harvests. In early Europe it was also the colour of coarse or undyed cloth, and therefore of modest people and of certain religious orders dressed in sackcloth: in the West it suggests simplicity, humility and sobriety. In modern lithotherapy, brown stones are linked with grounding, stability and nature, and often with the root chakra, which is depicted in red. These are recent conventions with no scientific evidence; see the root chakra. Traditions differ, and a brown stone has no official meaning.

Treatments, dyeing and imitations

Smoky quartz: a very dark, perfectly uniform brown is often obtained by artificial irradiation; heating, on the other hand, lightens the shade.
Tiger's eye: heating (bull's eye) is an old treatment, acceptable if it is disclosed; blue, green or red dyes are common.
Amber: copal (a much younger resin), reconstituted amber (pressed fragments), plastic and glass all imitate it. A piece of Baltic amber floats in very salty water, but some plastics and copal do too: this test is not conclusive. Avoid flame or solvent tests.
Petrified wood, jaspers, sardonyx, agates: dyeing and pieces glued together are possible.
Mahogany obsidian: manufactured glass is sometimes sold under this name.

For simple benchmarks, see real or fake stone.

Care and associations

Smoky quartz, tiger's eye, jaspers, petrified wood and staurolite are cleaned with lukewarm water and a soft cloth, then dried; some guides advise against prolonged exposure to full sun. Amber is damaged by alcohol, perfumes, solvents and knocks: a soft cloth is enough. Desert rose, septarian and goethite are cleaned dry, with a brush. Mahogany obsidian can chip and cut. The purification table gives the precautions for each stone. Brown goes well with green (green stones), cream and gold.

Frequently asked questions

Is smoky quartz always natural?

It does occur naturally, but a quartz that is almost black and perfectly uniform is often irradiated. Ask about the origin and compare it with a clear crystal from the same deposit.

How can I recognise real amber?

It is light, warm to the touch and soft. The very salty water test (it floats) is not enough: copal and some plastics float too. Trust a seller who states the origin.

What is the difference between tiger's eye and bull's eye?

Bull's eye is heated tiger's eye, a deeper red-brown. It is the same material, treated; the treatment should be stated.

Is petrified wood really wood?

It is fossil wood whose material has been replaced by silica. It keeps the shape and growth rings of wood, but it has become stone.

Can amber or desert rose go in water?

Better to avoid it: desert rose (gypsum) breaks down on contact with water, and amber is sensitive to products and knocks. A dry or barely damp cloth is enough.