Bloodstone | Gemopedia

Bloodstone is green jasper dotted with bright red spots of iron oxide. The green color is caused by small particles of chlorite, a silicate mineral or hornblende needles interspersed throughout the host material. Its distinctive reddish spots are caused by the presence of iron oxides.
Alternate
Names
Heliotrope
Colors
Green With Red, Brownish Spots

Bloodstone Classification

Common Name

Bloodstone

Species

Quartz

Variety

Chalcedony

Colors

Green With Red, Brownish Spots

Alternate Names

Heliotrope

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Green color caused by chlorite and hornblende and the red is caused by iron oxide. Misnomers: blood jasper

Bloodstone Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.535-1.539

Birefringence

0.004-0.004

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Bloodstone Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Bloodstone Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

Bloodstone is dark green with red or brown spots. Appearance is what separates bloodstone from other chalcedonies.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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