Crystal vs. Geode — What's the Difference?

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations.

A geode (; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.

A piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces

A hollow, usually spheroidal rock with crystals lining the inside wall.

Highly transparent glass with a high refractive index

(geology) A nodule of stone having a cavity lined with mineral or crystal matter on the inside wall.

Short for crystal meth (methamphetamine)

A nodule of stone, containing a cavity, lined with crystals or mineral matter.

Clear and transparent like crystal

(mineralogy) a hollow rock or nodule with the cavity usually lined with crystals

A homogenous solid formed by a repeating, three-dimensional pattern of atoms, ions, or molecules and having fixed distances between constituent parts.

The unit cell of such a pattern.

A mineral, especially a transparent form of quartz, having a crystalline structure, often characterized by external planar faces.

A natural or synthetic crystalline material having piezoelectric or semiconducting properties.

An electrical or electronic device that makes use of such a material, thereby allowing it to receive radio transmissions.

A high-quality, clear, colorless glass.

An object, especially a vessel or ornament, made of such glass.

Such objects considered as a group.

A clear glass or plastic protective cover for the face of a watch or clock.

(Slang) A stimulant drug, usually methamphetamine, in its powdered form.

Clear or transparent

(countable) A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.

(countable) A piece of glimmering, shining mineral resembling ice or glass.

(uncountable) A fine type of glassware, or the material used to make it.

Crystal meth: methamphetamine hydrochloride.

A person's eye.

The glass over the dial of a watch case.

Very clear.

The regular form which a substance tends to assume in solidifying, through the inherent power of cohesive attraction. It is bounded by plane surfaces, symmetrically arranged, and each species of crystal has fixed axial ratios. See Crystallization.

The material of quartz, in crystallization transparent or nearly so, and either colorless or slightly tinged with gray, or the like; - called also rock crystal. Ornamental vessels are made of it. Cf. Smoky quartz, Pebble; also Brazilian pebble, under Brazilian.

A species of glass, more perfect in its composition and manufacture than common glass, and often cut into ornamental forms. See Flint glass.

The glass over the dial of a watch case.

Anything resembling crystal, as clear water, etc.

Consisting of, or like, crystal; clear; transparent; lucid; pellucid; crystalline.

A solid formed by the solidification of a chemical and having a highly regular atomic structure

A crystalline element used as a component in various electronic devices

A rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces

Colorless glass made of almost pure silica

Glassware made of quartz

A protective cover that protects the face of a watch