Septaria | Gemopedia

Nicknamed the "dragon stone," septaria has unique mineral patterns that resemble tree branches. Specimens are usually in the form of sliced nodules ranging from an inch in diameter to more than three feet across. They are estimated to have formed between 50 and 70 million years ago after periodic volcanic eruptions killed small sea life. The shells and carcasses of these creatures sank to the sea bed, where sediments accumulated around them to form nodules or balls of mud. When the waters eventually receded, the mud balls dried out and began to shrink and crack into the beautiful patterns that you see inside the septarian nodules.
Alternate
Names
Septarian Concretions Or Septarian Nodules
Colors
Brown, Tan, Black, Gray, White, Reddish, Golden

Septaria Classification

Common Name

Septaria

Species

Septaria

Variety

Colors

Brown, Tan, Black, Gray, White, Reddish, Golden

Alternate Names

Septarian Concretions Or Septarian Nodules

Gemstone Groups

Key Separations

Appearance

Comments

Septarian nodules often contain calcite crystals and rarely pyrite.

Septaria Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Septaria Chemistry & Crystallography

Chemical Name

Chemical Formula

Synthesis

Crystal System

NA

Classification

Rock

Nature

Natural

Crystallinity

Aggregate

Comments

Septaria Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Inclusions

Septaria are cracks or separations in rock.

Luster

Dull

Stability

Fracture

Cleavage

None

Comments

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