CHALCEDONY
A microcrystalline variety of silicon dioxide, chalcedony usually occurs as mammillary or botryoidal masses. The colour is highly variable, and may be white, blue, red, green, brown, or black. Varieties of chalcedony include jasper, an opaque form; agate, a form with concentric banding of different colours; moss agate, with dark dendritic patterns; chrysoprase, a green variety; and onyx, in which the banding is parallel. Carnelian is red to reddish brown, and sard is light to dark brown.
What's this then???
Hardness: 7
The third, that is, the third decoration of the foundation is chalcedony; it is pale yellow, similar to lamp-light, and shines more under the open sky than indoors; warmed by the sun or by a rub of the fingers, it attracts particles to itself; it does not resist the subjects of the engraver, and it signifies the charity which is within us, hidden in the heart.
It is pale yellow like lamplight, but when it is forced into the open for the benefit of others, then what its virtue was inside is demonstrated outside. Touched by the sun, that is Christ, or the spirit, namely the finger, it attracts sinners to itself; that it cannot in any way be cut signifies that it is not wanting in times of adversity but is rather of advantage. In this context, it is said in the Song of Solomon: 'Love is strong as death; jealousy is cruel as the grave: the coals thereof are coals of fire, which hath a most vehement flame. Many waters cannot quench love' (8:6-7). It cannot, therefore, be carved, because it is not shattered by adversity or even softened by fulsome praise. In this context, the psalms: 'My head shall not be annointed with the oil of wicked men' (NEB, Psalms 141: 5); 1 Corinthians, 13: 'Charity is patient; it is kind; charity it suffers everything; it endures everything; it is not puffed up; it is not ambitious etc.' (see 13:4-5).
Verse
Chalcedony is a stone which shines with a faint paleness. It comes between the hyacinth and the beryl. Anyone who carries it will, it is said, be successful in lawsuits. Improves bone-marrow, spleen, red corpuscles and heart tissue. Stimulates optimism and enhances one’s spiritual and artistic creativity. From the Aberdeen Bestiary Project