Cogent

A crystal that ends in a single point — the argument that comes to a tip.

Rock Crystal Quartz · The Law of Possibility

Family: Quartz — SiO₂
Hardness: 7 on the Mohs scale
Colour: Colourless and transparent
Signature: Piezoelectric — squeeze it and it produces a measurable voltage

The stone read as the word

Rock crystal grows six flat faces that converge on one termination. Nothing about it wanders. A cogent case has the same geometry: broad at the base, narrowing, arriving at a point you can feel.

Squeeze quartz and it answers with current — the reason it keeps time in every watch. Pressure applied to a well-ordered thing produces signal, not noise.

What it is carried for

Carried for the case she has to make in five minutes.
Held when the point must land.