G1-a is one of the subsidiary pyramids of the Giza East Field

Giza East Field

The East Field is located to the east of Khufu’s pyramid and contains cemetery G 7000. This cemetery was a burial place for some of the family members of Khufu....

 of the Giza Necropolis immediately to the eastern side of the Great Pyramid of Giza

Great Pyramid of Giza

The Great Pyramid of Giza is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact...

, built during the Fourth dynasty of Egypt

Fourth dynasty of Egypt

The fourth dynasty of ancient Egypt is characterized as a "golden age" of the Old Kingdom. Dynasty IV lasted from ca. 2613 to 2494 BC...

. It is the northernmost of the three pyramids of the queens and has a base of 49.5 meters wide and originally a height of 30.25 metres; the pyramid has lost two-thirds of its original height. In the west wall of the burial chamber a small niche was dug in which were found fragments of basalt

Basalt

Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...

. It is also known as the Pyramid of Hetepheres I

Hetepheres I

Queen Hetepheres I was a Queen of Egypt during the 4th dynasty.- Biography :Hetepheres I may have been a daughter of pharaoh Huni. Her title God's Daughter suggests she was the daughter of a king and the most likely candidate is Huni, the predecessor of Sneferu...

 as discovered by Mark Lehner

Mark Lehner

Mark Lehner PhD is an American archaeologist with more than 30 years of experience excavating in Egypt. His approach, as director of Ancient Egypt Research Associates , is to conduct interdisciplinary archaeological investigation. Every excavated object is examined by specialists to create an...

; it was originally thought to belong to Queen Meritites I

Meritites I

Meritites I was an ancient Egyptian Queen of the 4th dynasty.She was a daughter of King Sneferu and the wife of King Khufu. Her name means "Beloved of her Father". Several of her titles are known from a stela found at Giza. She was the mother of Crown Prince Kawab and may have had several more...

.