Class G geocrystalline planet

For other uses, see Class G.

class G geocrystalline
Classification:	geocrystalline
Age:	3-4 billion years
Diameter:	10,000-15,000 km
Location:	ecosphere
Surface:	still crystallizing
Atmosphere:	carbon dioxide, some toxic gases
Evolution:	cools to become class K, L,M, N, O, or P
Lifeforms:	Primitive single-celled organisms

Class G geocrystalline, in planetary classification, is a type of planet. The relatively young geocrystalline worlds have also been classified as class F planets on other scales, and are possessed of a mostly carbon dioxide atmosphere with some toxic gases, released as the planet cools and crystallizes. Lifeforms usually only exists as single-celled organisms due to the absence of free water on the young world. These planets are generally between three to four billion years old and measure 10,000 to 15,000 kilometers in diameter. (ST reference: Star Charts)

In the reference books Star Trek Maps and The Worlds of the Federation, planets similar to geocrystalline worlds are called "class F planets".

Planets of this type

• Delta Vega I
• Rigel XVI
• Sienae I

Appendices

Connections

Planetary classification
numeric:	class 9 ("Q'tahL"-class)	alphabetical:	class A class A geothermal class A gas giant
class B class B geomorteus class B gas giant	class C class C geoinactive class C reducing	class D	class E
class F class F geometallic class F geocrystalline	class G class G geocrystalline class G desert	class H class H desert class H geothermal	class I class I gas supergiant ("Q'tahL"-class) class I metallic/silicate
class J class J gas giant class J moon	class K class K silicate/adaptable class K transjovian	class L	class M ("Minshara"-class) class MZ
class N class N reducing class N pelagic	class O	class P	class Q
class R	class S	class T	class Y ("Demon"-class)

References

• ST reference: Star Charts