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Dalmatian Jasper

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Chemical Formula

SiO2

Composition

Silicon dioxide, usually with impurities of iron oxides or organic substances.

Color

Brown, yellow, orange, red, green, or blue. May also refer to any form of opaque Chalcedony in all colors. Jasper is usually multicolored or banded.

Streak

White

Hardness

6.5 - 7

Crystal System

Hexagonal

Crystal Forms 
and Aggregates

Jasper is a microcrystalline form of the mineral Quartz, and does not occur in visible crystals. It most often is in massive form, but may also be botryoidal, mammilary, and stalactitic formations, as smooth rounded pebbles, and as nodules.

Transparency

Opaque

Specific Gravity

2.7 - 2.7

Luster

Vitreous

Cleavage

None

Fracture

Conchoidal

Tenacity

Brittle

Other ID Marks

1) Sometimes fluorescent.
2) Triboluminescent
3) Piezoelectric

Complex Tests

Dissolves in hydrofluoric acid.

In Group

Silicates; Tectosilicates; Silica Group

Striking Features

Color habits and hardness

Environment

Occurs in all mineral environments.

Rock Type

Igneous, Sedimentary, Metamorphic

Popularity (1-4)

1

Prevalence (1-3)

1

Demand (1-3)

1

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